{
    "cdp_num": null,
    "comment": "SURVEY MARKER BOLT WITH THREAD ON THE\n0.7 m STEEL TUBE, SCREW ANCHORED TO\nTHE STEEL SURVEY PLATFORM 3.3 m ABOVE\nTHE ROOF. THE SURVEY PLATFORM IS ANCHORED\nTO THE ROOF OF THE MAINBUILDING IN THE\nAMT FUER GEOINFORMATIONSWESEN DER\nBUNDESWEHR.\nTHE ANTENNA IS 4.8 m ABOVE THE ROOF\nAND 28.9 m ABOVE THE GROUND.",
    "conditions": [],
    "country": "Germany",
    "country_code_ISO": "DEU",
    "date_from": "1998-04-02 00:00:00",
    "date_to": null,
    "description": "SURVEY MARKER WITH THREAD",
    "geological": {
        "bedrock": {
            "condition": null,
            "type": null
        },
        "characteristic": null,
        "distance_to_fault": null,
        "fault_zone": null,
        "fracture_spacing": null
    },
    "iers_domes": "14258M003",
    "instrument_collocation": [
        {
            "comment": "Informations for other GPS-Campaigns\ncontact AGeoBw, see 11.",
            "date_from": "2000-05-06 00:00:00",
            "date_to": "2000-05-07 00:00:00",
            "status": "PERMANENT",
            "type": "GPS DREF 0301"
        },
        {
            "comment": "Secondary Receiver at the same antenna.\nMore information and data available on\nrequest.",
            "date_from": "2022-08-16 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "GNSS EUSK01DEU"
        }
    ],
    "local_ties": [
        {
            "accuracy": 1,
            "comment": "System ETRS89, Ellipsoid GRS80.\nTP-No 3005",
            "cpd_num": null,
            "date_at": "2000-05-06 00:00:00",
            "dx": 0.974,
            "dy": 0.455,
            "dz": -0.75,
            "iers_domes": null,
            "name": "DREF 0301",
            "survey_method": "GPS",
            "usage": "GPS"
        }
    ],
    "location": {
        "city": "Euskirchen",
        "coordinates": {
            "X": 4022106.37,
            "Y": 477010.95,
            "Z": 4910840.64,
            "altitude": 245.3,
            "lat": 50.67413063653398,
            "lon": 6.76353232487443
        },
        "country": "Germany",
        "country_iso_code": "DEU",
        "description": "",
        "state": "Northrhine-Westfalia",
        "tectonic": {
            "plate_name": "EURASIAN"
        }
    },
    "logs": {
        "contact": "GREF Operator (operator.gref@bkg.bund.de)",
        "date": "2026-03-27 00:00:00",
        "log_type": "UPDATE",
        "modified": "UNAVAILABLE",
        "previous": "UNAVAILABLE",
        "title": "EUSK00DEU.xml"
    },
    "marker": "EUSK",
    "monument": {
        "description": "STEEL TUBE ON ROOF SURVEY PLATFORM",
        "foundation": "STEEL TUBE SCREW ANCHORED TO PLATFORM",
        "foundation_depth": null,
        "height": 0.7,
        "monument_inscription": null
    },
    "monument_num": 0,
    "name": "Euskirchen",
    "receiver_num": 0,
    "station_contacts": [
        {
            "contact": {
                "agency": {
                    "abbreviation": "BKG",
                    "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                    "infos": "",
                    "name": "Bundesamt fuer Kartographie und Geodaesie",
                    "www": ""
                },
                "comment": "",
                "email": "bkg-gdc@bkg.bund.de",
                "name": "BKG GNSS Data Center",
                "phone": "+49 69 6333274",
                "role": "site_owner",
                "title": ""
            }
        },
        {
            "contact": {
                "agency": {
                    "abbreviation": "BKG",
                    "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                    "infos": "",
                    "name": "Bundesamt fuer Kartographie und Geodaesie",
                    "www": ""
                },
                "comment": "",
                "email": "operator.gref@bkg.bund.de",
                "name": "GREF Operator",
                "phone": "+49 341 5634410",
                "role": "metadata_custodian",
                "title": ""
            }
        }
    ],
    "station_items": [
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1998-04-02 00:00:00",
                "date_to": "1999-08-17 09:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "1999-08-17 09:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TRIMBLE 4000SSI"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "1999-08-17 09:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3450A09057"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "1999-08-17 09:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "1999-08-17 09:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7.12"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "1999-08-17 09:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "1999-08-17 09:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1999-08-17 09:00:00",
                "date_to": "2008-07-03 09:04:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "1999-08-17 09:00:00",
                        "date_to": "2008-07-03 09:04:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TRIMBLE 4000SSI"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1999-08-17 09:00:00",
                        "date_to": "2008-07-03 09:04:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3450A09057"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "1999-08-17 09:00:00",
                        "date_to": "2008-07-03 09:04:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "1999-08-17 09:00:00",
                        "date_to": "2008-07-03 09:04:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7.29"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "1999-08-17 09:00:00",
                        "date_to": "2008-07-03 09:04:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "1999-08-17 09:00:00",
                        "date_to": "2008-07-03 09:04:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2008-07-03 09:05:00",
                "date_to": "2009-11-17 13:09:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2008-07-03 09:05:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TRIMBLE 4000SSI"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2008-07-03 09:05:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3550A13363"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2008-07-03 09:05:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2008-07-03 09:05:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7.19"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2008-07-03 09:05:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2008-07-03 09:05:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2009-11-17 13:10:00",
                "date_to": "2010-02-18 10:29:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2010-02-18 10:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2010-02-18 10:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "356532"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2010-02-18 10:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2010-02-18 10:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7.53"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2010-02-18 10:29:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2010-02-18 10:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2010-02-18 10:30:00",
                "date_to": "2010-03-18 09:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2010-02-18 10:30:00",
                        "date_to": "2010-03-18 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2010-02-18 10:30:00",
                        "date_to": "2010-03-18 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "356532"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2010-02-18 10:30:00",
                        "date_to": "2010-03-18 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2010-02-18 10:30:00",
                        "date_to": "2010-03-18 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7.80"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2010-02-18 10:30:00",
                        "date_to": "2010-03-18 09:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2010-02-18 10:30:00",
                        "date_to": "2010-03-18 09:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2010-03-18 10:00:00",
                "date_to": "2010-10-05 08:24:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2010-03-18 10:00:00",
                        "date_to": "2010-10-05 08:24:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2010-03-18 10:00:00",
                        "date_to": "2010-10-05 08:24:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "356532"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2010-03-18 10:00:00",
                        "date_to": "2010-10-05 08:24:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2010-03-18 10:00:00",
                        "date_to": "2010-10-05 08:24:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7.80\/3.018"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2010-03-18 10:00:00",
                        "date_to": "2010-10-05 08:24:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2010-03-18 10:00:00",
                        "date_to": "2010-10-05 08:24:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2010-10-05 08:25:00",
                "date_to": "2011-04-07 13:44:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2010-10-05 08:25:00",
                        "date_to": "2011-04-07 13:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2010-10-05 08:25:00",
                        "date_to": "2011-04-07 13:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "356532"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2010-10-05 08:25:00",
                        "date_to": "2011-04-07 13:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2010-10-05 08:25:00",
                        "date_to": "2011-04-07 13:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7.80\/3.019"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2010-10-05 08:25:00",
                        "date_to": "2011-04-07 13:44:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2010-10-05 08:25:00",
                        "date_to": "2011-04-07 13:44:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2011-04-07 13:45:00",
                "date_to": "2014-03-25 12:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2011-04-07 13:45:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2011-04-07 13:45:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "356532"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2011-04-07 13:45:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2011-04-07 13:45:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "8.10\/3.019"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2011-04-07 13:45:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2011-04-07 13:45:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2014-03-25 13:00:00",
                "date_to": "2014-09-11 09:29:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": "2014-09-11 09:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR25"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": "2014-09-11 09:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1831025"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": "2014-09-11 09:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": "2014-09-11 09:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.03\/6.214"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": "2014-09-11 09:29:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": "2014-09-11 09:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2014-09-11 09:30:00",
                "date_to": "2014-11-03 12:29:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2014-09-11 09:30:00",
                        "date_to": "2014-11-03 12:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR25"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2014-09-11 09:30:00",
                        "date_to": "2014-11-03 12:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1831025"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2014-09-11 09:30:00",
                        "date_to": "2014-11-03 12:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2014-09-11 09:30:00",
                        "date_to": "2014-11-03 12:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.10.1633\/6.403"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2014-09-11 09:30:00",
                        "date_to": "2014-11-03 12:29:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2014-09-11 09:30:00",
                        "date_to": "2014-11-03 12:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2014-11-03 12:30:00",
                "date_to": "2015-11-24 10:24:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2014-11-03 12:30:00",
                        "date_to": "2015-11-24 10:24:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR25"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2014-11-03 12:30:00",
                        "date_to": "2015-11-24 10:24:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1831025"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2014-11-03 12:30:00",
                        "date_to": "2015-11-24 10:24:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2014-11-03 12:30:00",
                        "date_to": "2015-11-24 10:24:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.11.1639\/6.403"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2014-11-03 12:30:00",
                        "date_to": "2015-11-24 10:24:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2014-11-03 12:30:00",
                        "date_to": "2015-11-24 10:24:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2015-11-24 10:25:00",
                "date_to": "2016-11-10 13:18:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2015-11-24 10:25:00",
                        "date_to": "2016-11-10 13:18:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR25"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2015-11-24 10:25:00",
                        "date_to": "2016-11-10 13:18:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1831025"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2015-11-24 10:25:00",
                        "date_to": "2016-11-10 13:18:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2015-11-24 10:25:00",
                        "date_to": "2016-11-10 13:18:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.22\/6.521"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2015-11-24 10:25:00",
                        "date_to": "2016-11-10 13:18:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2015-11-24 10:25:00",
                        "date_to": "2016-11-10 13:18:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2016-11-10 13:22:00",
                "date_to": "2017-05-04 09:25:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2016-11-10 13:22:00",
                        "date_to": "2017-05-04 09:25:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR25"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2016-11-10 13:22:00",
                        "date_to": "2017-05-04 09:25:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1831025"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2016-11-10 13:22:00",
                        "date_to": "2017-05-04 09:25:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2016-11-10 13:22:00",
                        "date_to": "2017-05-04 09:25:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.02\/6.522"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2016-11-10 13:22:00",
                        "date_to": "2017-05-04 09:25:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2016-11-10 13:22:00",
                        "date_to": "2017-05-04 09:25:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2017-05-04 09:35:00",
                "date_to": "2018-01-29 13:05:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2017-05-04 09:35:00",
                        "date_to": "2018-01-29 13:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR25"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2017-05-04 09:35:00",
                        "date_to": "2018-01-29 13:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1831025"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2017-05-04 09:35:00",
                        "date_to": "2018-01-29 13:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2017-05-04 09:35:00",
                        "date_to": "2018-01-29 13:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.11\/6.523"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2017-05-04 09:35:00",
                        "date_to": "2018-01-29 13:05:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2017-05-04 09:35:00",
                        "date_to": "2018-01-29 13:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2018-01-29 13:30:00",
                "date_to": "2018-05-30 08:30:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2018-01-29 13:30:00",
                        "date_to": "2018-05-30 08:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR50"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2018-01-29 13:30:00",
                        "date_to": "2018-05-30 08:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1870607"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2018-01-29 13:30:00",
                        "date_to": "2018-05-30 08:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2018-01-29 13:30:00",
                        "date_to": "2018-05-30 08:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.11\/7.102"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2018-01-29 13:30:00",
                        "date_to": "2018-05-30 08:30:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2018-01-29 13:30:00",
                        "date_to": "2018-05-30 08:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2018-05-30 08:40:00",
                "date_to": "2018-11-26 11:05:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2018-05-30 08:40:00",
                        "date_to": "2018-11-26 11:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR50"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2018-05-30 08:40:00",
                        "date_to": "2018-11-26 11:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1870607"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2018-05-30 08:40:00",
                        "date_to": "2018-11-26 11:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2018-05-30 08:40:00",
                        "date_to": "2018-11-26 11:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.20\/7.300"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2018-05-30 08:40:00",
                        "date_to": "2018-11-26 11:05:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2018-05-30 08:40:00",
                        "date_to": "2018-11-26 11:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2018-11-26 11:10:00",
                "date_to": "2018-12-02 17:45:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2018-11-26 11:10:00",
                        "date_to": "2018-12-02 17:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR50"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2018-11-26 11:10:00",
                        "date_to": "2018-12-02 17:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1870607"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2018-11-26 11:10:00",
                        "date_to": "2018-12-02 17:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2018-11-26 11:10:00",
                        "date_to": "2018-12-02 17:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.30\/7.402"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2018-11-26 11:10:00",
                        "date_to": "2018-12-02 17:45:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2018-11-26 11:10:00",
                        "date_to": "2018-12-02 17:45:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2018-12-02 17:50:00",
                "date_to": "2021-05-19 13:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2018-12-02 17:50:00",
                        "date_to": "2021-05-19 13:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR50"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2018-12-02 17:50:00",
                        "date_to": "2021-05-19 13:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1870607"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2018-12-02 17:50:00",
                        "date_to": "2021-05-19 13:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2018-12-02 17:50:00",
                        "date_to": "2021-05-19 13:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.31\/7.403"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2018-12-02 17:50:00",
                        "date_to": "2021-05-19 13:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2018-12-02 17:50:00",
                        "date_to": "2021-05-19 13:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2021-05-19 13:05:00",
                "date_to": "2022-03-03 08:05:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2021-05-19 13:05:00",
                        "date_to": "2022-03-03 08:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR50"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2021-05-19 13:05:00",
                        "date_to": "2022-03-03 08:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1870607"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2021-05-19 13:05:00",
                        "date_to": "2022-03-03 08:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2021-05-19 13:05:00",
                        "date_to": "2022-03-03 08:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.50\/7.710"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2021-05-19 13:05:00",
                        "date_to": "2022-03-03 08:05:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2021-05-19 13:05:00",
                        "date_to": "2022-03-03 08:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2022-03-03 08:05:00",
                "date_to": "2022-03-31 09:32:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2022-03-03 08:05:00",
                        "date_to": "2022-03-31 09:32:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR50"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2022-03-03 08:05:00",
                        "date_to": "2022-03-31 09:32:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1870607"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2022-03-03 08:05:00",
                        "date_to": "2022-03-31 09:32:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2022-03-03 08:05:00",
                        "date_to": "2022-03-31 09:32:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.52\/7.711"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2022-03-03 08:05:00",
                        "date_to": "2022-03-31 09:32:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2022-03-03 08:05:00",
                        "date_to": "2022-03-31 09:32:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2022-03-31 09:32:00",
                "date_to": "2022-09-05 11:17:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2022-03-31 09:32:00",
                        "date_to": "2022-09-05 11:17:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR50"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2022-03-31 09:32:00",
                        "date_to": "2022-09-05 11:17:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1831175"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2022-03-31 09:32:00",
                        "date_to": "2022-09-05 11:17:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2022-03-31 09:32:00",
                        "date_to": "2022-09-05 11:17:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.52\/7.711"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2022-03-31 09:32:00",
                        "date_to": "2022-09-05 11:17:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2022-03-31 09:32:00",
                        "date_to": "2022-09-05 11:17:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2022-09-05 11:17:00",
                "date_to": "2023-02-08 10:18:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2022-09-05 11:17:00",
                        "date_to": "2023-02-08 10:18:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR50"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2022-09-05 11:17:00",
                        "date_to": "2023-02-08 10:18:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1831175"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2022-09-05 11:17:00",
                        "date_to": "2023-02-08 10:18:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2022-09-05 11:17:00",
                        "date_to": "2023-02-08 10:18:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.60\/7.811"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2022-09-05 11:17:00",
                        "date_to": "2023-02-08 10:18:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2022-09-05 11:17:00",
                        "date_to": "2023-02-08 10:18:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2023-02-08 10:18:00",
                "date_to": "2023-11-13 09:33:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2023-02-08 10:18:00",
                        "date_to": "2023-11-13 09:33:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR50"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2023-02-08 10:18:00",
                        "date_to": "2023-11-13 09:33:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1831175"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2023-02-08 10:18:00",
                        "date_to": "2023-11-13 09:33:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2023-02-08 10:18:00",
                        "date_to": "2023-11-13 09:33:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.61\/7.811"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2023-02-08 10:18:00",
                        "date_to": "2023-11-13 09:33:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2023-02-08 10:18:00",
                        "date_to": "2023-11-13 09:33:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2023-11-13 09:43:00",
                "date_to": "2024-09-19 10:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2023-11-13 09:43:00",
                        "date_to": "2024-09-19 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GR50"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2023-11-13 09:43:00",
                        "date_to": "2024-09-19 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "1831175"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2023-11-13 09:43:00",
                        "date_to": "2024-09-19 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2023-11-13 09:43:00",
                        "date_to": "2024-09-19 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.70\/7.813"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2023-11-13 09:43:00",
                        "date_to": "2024-09-19 10:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2023-11-13 09:43:00",
                        "date_to": "2024-09-19 10:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2024-09-19 10:00:00",
                "date_to": "2025-06-06 08:28:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2024-09-19 10:00:00",
                        "date_to": "2025-06-06 08:28:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "SEPT POLARX5E"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2024-09-19 10:00:00",
                        "date_to": "2025-06-06 08:28:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3084698"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2024-09-19 10:00:00",
                        "date_to": "2025-06-06 08:28:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2024-09-19 10:00:00",
                        "date_to": "2025-06-06 08:28:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "5.5.0"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2024-09-19 10:00:00",
                        "date_to": "2025-06-06 08:28:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2024-09-19 10:00:00",
                        "date_to": "2025-06-06 08:28:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2025-06-06 08:28:00",
                "date_to": "2026-03-27 07:20:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2025-06-06 08:28:00",
                        "date_to": "2026-03-27 07:20:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "SEPT POLARX5E"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2025-06-06 08:28:00",
                        "date_to": "2026-03-27 07:20:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3084698"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2025-06-06 08:28:00",
                        "date_to": "2026-03-27 07:20:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2025-06-06 08:28:00",
                        "date_to": "2026-03-27 07:20:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "5.6.0"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2025-06-06 08:28:00",
                        "date_to": "2026-03-27 07:20:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2025-06-06 08:28:00",
                        "date_to": "2026-03-27 07:20:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2026-03-27 07:20:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2026-03-27 07:20:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "SEPT POLARX5E"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2026-03-27 07:20:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3084698"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2026-03-27 07:20:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL+BDS+SBAS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2026-03-27 07:20:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "5.7.0"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2026-03-27 07:20:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2026-03-27 07:20:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "TRIMBLE 24490-00 Prod\nAss Ext Dome.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1998-04-02 00:00:00",
                "date_to": "2001-05-09 07:30:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2001-05-09 07:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TRM22020.00+GP"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2001-05-09 07:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "0220077550"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2001-05-09 07:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BPA"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2001-05-09 07:30:00",
                        "value_date": null,
                        "value_numeric": 0.055,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2001-05-09 07:30:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2001-05-09 07:30:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2001-05-09 07:30:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2001-05-09 07:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "RG 214"
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2001-05-09 07:30:00",
                        "value_date": null,
                        "value_numeric": 30,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": "TRIMBLE 24490-00 Prod\nAss Ext Dome.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1998-04-02 00:00:00",
                "date_to": "2001-05-09 07:30:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2001-05-09 07:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "DOME"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2001-05-09 07:30:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2001-05-09 07:30:00",
                "date_to": "2009-11-17 13:09:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "2001-05-09 07:30:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "TRM29659.00"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2001-05-09 07:30:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "0220180419"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "2001-05-09 07:30:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BPA"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "2001-05-09 07:30:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": 0.051,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "2001-05-09 07:30:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "2001-05-09 07:30:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "2001-05-09 07:30:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "2001-05-09 07:30:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "RG 214"
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "2001-05-09 07:30:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": 30,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2001-05-09 07:30:00",
                "date_to": "2009-11-17 13:09:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "2001-05-09 07:30:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NONE"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2001-05-09 07:30:00",
                        "date_to": "2009-11-17 13:09:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": "Antenna \/ radome pair individual\ncalibrated absolute at Geo++\n2008-04-15.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2009-11-17 13:10:00",
                "date_to": "2014-03-25 12:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEIAT504GG"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "200460"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BPA"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": 0.032,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ECOFLEX 10"
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": 20,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": "Antenna \/ radome pair individual\ncalibrated absolute at Geo++\n2008-04-15.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2009-11-17 13:10:00",
                "date_to": "2014-03-25 12:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEIS"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2009-11-17 13:10:00",
                        "date_to": "2014-03-25 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": "Antenna \/ radome pair calibrated\nat Geo++ 2011-11-10 and\ncalibrated at University Bonn\n2012-03-02.\nAntenna height was incorrectly\nreported as 0.0320 from 2014-03-25\nuntil 2014-04-02. The true antenna\nheight is 0.0330 m.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2014-03-25 13:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEIAR25.R4"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "725299"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BPA"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0.033,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ECOFLEX 10"
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 20,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": "Antenna \/ radome pair calibrated\nat Geo++ 2011-11-10 and\ncalibrated at University Bonn\n2012-03-02.\nAntenna height was incorrectly\nreported as 0.0320 from 2014-03-25\nuntil 2014-04-02. The true antenna\nheight is 0.0330 m.",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2014-03-25 13:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEIT"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2014-03-25 13:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "None"
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1998-04-02 00:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "INTERNAL"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1998-04-02 00:00:00",
                "date_to": "2000-11-12 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "sensor_model"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "809 L0-100 PERNIX"
                    },
                    {
                        "attribute": {
                            "name": "manufacturer"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LAMBRECHT GOETTINGEN"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "data_sampling_interval"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": 60,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "accuracy"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "aspiration"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "PERNIX ELEMENT"
                    },
                    {
                        "attribute": {
                            "name": "height_diff_to_ant"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": 1,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "calibration_date"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "humidity_sensor"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2000-11-13 00:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "sensor_model"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "MET 3"
                    },
                    {
                        "attribute": {
                            "name": "manufacturer"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "PARASCIENTIFIC INC."
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "data_sampling_interval"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 60,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "accuracy"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 2,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "aspiration"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "FAN ASPIRATED CAPACITANCE PROBE"
                    },
                    {
                        "attribute": {
                            "name": "height_diff_to_ant"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 1,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "calibration_date"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "humidity_sensor"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1998-04-02 00:00:00",
                "date_to": "2000-11-12 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "sensor_model"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "812 B 800 - 1100"
                    },
                    {
                        "attribute": {
                            "name": "manufacturer"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LAMBRECHT GOETTINGEN"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "data_sampling_interval"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": 60,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "accuracy"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": 0.4,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "height_diff_to_ant"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": 0.6,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "calibration_date"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-12 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "pressure_sensor"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2000-11-13 00:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "sensor_model"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "MET 3"
                    },
                    {
                        "attribute": {
                            "name": "manufacturer"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "PARASCIENTIFIC INC."
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "data_sampling_interval"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 60,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "accuracy"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0.1,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "height_diff_to_ant"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 1,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "calibration_date"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "pressure_sensor"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1998-04-02 00:00:00",
                "date_to": "2000-11-13 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "sensor_model"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-13 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "809 L0-100 PT 100"
                    },
                    {
                        "attribute": {
                            "name": "manufacturer"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-13 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LAMBRECHT GOETTINGEN"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-13 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "data_sampling_interval"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-13 00:00:00",
                        "value_date": null,
                        "value_numeric": 60,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "accuracy"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-13 00:00:00",
                        "value_date": null,
                        "value_numeric": 0.5,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "aspiration"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-13 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "PLATINUM PROBE"
                    },
                    {
                        "attribute": {
                            "name": "height_diff_to_ant"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-13 00:00:00",
                        "value_date": null,
                        "value_numeric": 1,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "calibration_date"
                        },
                        "date_from": "1998-04-02 00:00:00",
                        "date_to": "2000-11-13 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "temperature_sensor"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "operator.gref@bkg.bund.de",
                    "name": "GREF Operator",
                    "phone": "+49 341 5634410",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
                        "address": "Richard-Strauss-Allee 11\nD-60598 Frankfurt a.M.\nGermany",
                        "infos": "",
                        "name": "Bundesamt fuer Kartographie und Geodaesie",
                        "www": ""
                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2000-11-13 00:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "sensor_model"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "MET 3"
                    },
                    {
                        "attribute": {
                            "name": "manufacturer"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "PARASCIENTIFIC INC."
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "data_sampling_interval"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 60,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "accuracy"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0.5,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "aspiration"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "FAN ASPIRATED PLATINUM RESITANCE PROBE"
                    },
                    {
                        "attribute": {
                            "name": "height_diff_to_ant"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 1,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "calibration_date"
                        },
                        "date_from": "2000-11-13 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "temperature_sensor"
                }
            }
        }
    ],
    "station_networks": [
        {
            "name": "EPN"
        },
        {
            "name": "EPOS"
        }
    ],
    "station_type": "GNSS Continuous"
}