{
    "cdp_num": null,
    "comment": null,
    "conditions": [],
    "country": "Germany",
    "country_code_ISO": "DEU",
    "date_from": "1999-01-02 00:00:00",
    "date_to": null,
    "description": "BRASS NAIL",
    "geological": {
        "bedrock": {
            "condition": null,
            "type": "SEDIMENTARY"
        },
        "characteristic": "SAND",
        "distance_to_fault": null,
        "fault_zone": null,
        "fracture_spacing": null
    },
    "iers_domes": "10914M002",
    "instrument_collocation": [],
    "local_ties": [],
    "location": {
        "city": "List",
        "coordinates": {
            "X": 3626143.397,
            "Y": 536248.552,
            "Z": 5202182.062,
            "altitude": 73.1,
            "lat": 55.011570290132255,
            "lon": 8.412158325510434
        },
        "country": "Germany",
        "country_iso_code": "DEU",
        "description": "",
        "state": "Schleswig-Holstein",
        "tectonic": {
            "plate_name": "EURASIAN"
        }
    },
    "logs": {
        "contact": "GFZ Network Operator (gnss@gfz-potsdam.de)",
        "date": "2025-08-14 00:00:00",
        "log_type": "UPDATE",
        "modified": "UNAVAILABLE",
        "previous": "UNAVAILABLE",
        "title": "SYLT00DEU.xml"
    },
    "marker": "SYLT",
    "monument": {
        "description": "PILLAR",
        "foundation": "CONCRETE BLOCK",
        "foundation_depth": null,
        "height": 0.2,
        "monument_inscription": null
    },
    "monument_num": 0,
    "name": "SYLT",
    "receiver_num": 0,
    "station_contacts": [
        {
            "contact": {
                "agency": {
                    "abbreviation": "GFZ",
                    "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                    "infos": "",
                    "name": "GFZ Helmholtz Centre for Geosciences",
                    "www": ""
                },
                "comment": "",
                "email": "gnss@gfz.de",
                "name": "GFZ Network Operator",
                "phone": "",
                "role": "site_owner",
                "title": ""
            }
        },
        {
            "contact": {
                "agency": {
                    "abbreviation": "GFZ",
                    "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                    "infos": "",
                    "name": "GFZ Helmholtz Centre for Geosciences",
                    "www": ""
                },
                "comment": "",
                "email": "gnss@gfz-potsdam.de",
                "name": "GFZ Network Operator",
                "phone": "",
                "role": "metadata_custodian",
                "title": ""
            }
        }
    ],
    "station_items": [
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1999-01-02 00:00:00",
                "date_to": "2003-04-10 23:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "AOA BENCHMARK ACT"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "unknown"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "unknown"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "FW: OEM-4-3.00-22T",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2005-03-10 00:00:00",
                "date_to": "2010-12-08 12:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NOV OEM4-G2"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "0009"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4-3.00-22T"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": 5,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2010-12-09 00:00:00",
                "date_to": "2011-12-20 11:25:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": "2011-12-20 11:25:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": "2011-12-20 11:25:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "202"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": "2011-12-20 11:25:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": "2011-12-20 11:25:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.1.7"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": "2011-12-20 11:25:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": "2011-12-20 11:25:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2011-12-20 11:25:00",
                "date_to": "2012-06-12 09:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2011-12-20 11:25:00",
                        "date_to": "2012-06-12 09:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2011-12-20 11:25:00",
                        "date_to": "2012-06-12 09:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "202"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2011-12-20 11:25:00",
                        "date_to": "2012-06-12 09:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2011-12-20 11:25:00",
                        "date_to": "2012-06-12 09:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.3.5"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2011-12-20 11:25:00",
                        "date_to": "2012-06-12 09:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2011-12-20 11:25:00",
                        "date_to": "2012-06-12 09:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2012-06-12 09:00:00",
                "date_to": "2013-01-09 09:49:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2012-06-12 09:00:00",
                        "date_to": "2013-01-09 09:49:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2012-06-12 09:00:00",
                        "date_to": "2013-01-09 09:49:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "202"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2012-06-12 09:00:00",
                        "date_to": "2013-01-09 09:49:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2012-06-12 09:00:00",
                        "date_to": "2013-01-09 09:49:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.4.4b0"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2012-06-12 09:00:00",
                        "date_to": "2013-01-09 09:49:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2012-06-12 09:00:00",
                        "date_to": "2013-01-09 09:49:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2013-01-09 09:50:00",
                "date_to": "2016-10-25 08:20:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2013-01-09 09:50:00",
                        "date_to": "2016-10-25 08:20:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2013-01-09 09:50:00",
                        "date_to": "2016-10-25 08:20:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "202"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2013-01-09 09:50:00",
                        "date_to": "2016-10-25 08:20:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2013-01-09 09:50:00",
                        "date_to": "2016-10-25 08:20:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.4.7"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2013-01-09 09:50:00",
                        "date_to": "2016-10-25 08:20:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2013-01-09 09:50:00",
                        "date_to": "2016-10-25 08:20:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "enables tracking of E01\/E02",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2016-10-25 08:20:00",
                "date_to": "2018-07-09 14:34:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2016-10-25 08:20:00",
                        "date_to": "2018-07-09 14:34:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2016-10-25 08:20:00",
                        "date_to": "2018-07-09 14:34:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "202"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2016-10-25 08:20:00",
                        "date_to": "2018-07-09 14:34:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2016-10-25 08:20:00",
                        "date_to": "2018-07-09 14:34:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.6.7"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2016-10-25 08:20:00",
                        "date_to": "2018-07-09 14:34:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2016-10-25 08:20:00",
                        "date_to": "2018-07-09 14:34:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Board revision TRE_G3TH_5",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2018-07-09 14:35:00",
                "date_to": "2019-02-22 15:21:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2018-07-09 14:35:00",
                        "date_to": "2019-02-22 15:21:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2018-07-09 14:35:00",
                        "date_to": "2019-02-22 15:21:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "202"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2018-07-09 14:35:00",
                        "date_to": "2019-02-22 15:21:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2018-07-09 14:35:00",
                        "date_to": "2019-02-22 15:21:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.7.3P1"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2018-07-09 14:35:00",
                        "date_to": "2019-02-22 15:21:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2018-07-09 14:35:00",
                        "date_to": "2019-02-22 15:21:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Board revision TRE_G3TH_5",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2019-02-22 15:22:00",
                "date_to": "2020-03-26 10:46:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2019-02-22 15:22:00",
                        "date_to": "2020-03-26 10:46:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2019-02-22 15:22:00",
                        "date_to": "2020-03-26 10:46:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "202"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2019-02-22 15:22:00",
                        "date_to": "2020-03-26 10:46:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2019-02-22 15:22:00",
                        "date_to": "2020-03-26 10:46:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.7.5P1"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2019-02-22 15:22:00",
                        "date_to": "2020-03-26 10:46:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2019-02-22 15:22:00",
                        "date_to": "2020-03-26 10:46:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Board revision TRE_G3TH_5\r\nActivation of independent tracking",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2020-03-26 10:47:00",
                "date_to": "2020-11-11 14:07:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2020-03-26 10:47:00",
                        "date_to": "2020-11-11 14:07:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2020-03-26 10:47:00",
                        "date_to": "2020-11-11 14:07:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "202"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2020-03-26 10:47:00",
                        "date_to": "2020-11-11 14:07:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2020-03-26 10:47:00",
                        "date_to": "2020-11-11 14:07:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.7.9"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2020-03-26 10:47:00",
                        "date_to": "2020-11-11 14:07:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2020-03-26 10:47:00",
                        "date_to": "2020-11-11 14:07:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Board revision TRE_G3TH_5",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2020-11-11 14:08:00",
                "date_to": "2021-06-23 13:47:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2020-11-11 14:08:00",
                        "date_to": "2021-06-23 13:47:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2020-11-11 14:08:00",
                        "date_to": "2021-06-23 13:47:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "202"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2020-11-11 14:08:00",
                        "date_to": "2021-06-23 13:47:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2020-11-11 14:08:00",
                        "date_to": "2021-06-23 13:47:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.7.10"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2020-11-11 14:08:00",
                        "date_to": "2021-06-23 13:47:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2020-11-11 14:08:00",
                        "date_to": "2021-06-23 13:47:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Board revision TRE_G3TH_5\r\ndeactivated clock steering",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2021-06-23 13:48:00",
                "date_to": "2023-01-17 14:37:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2021-06-23 13:48:00",
                        "date_to": "2023-01-17 14:37:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2021-06-23 13:48:00",
                        "date_to": "2023-01-17 14:37:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "202"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2021-06-23 13:48:00",
                        "date_to": "2023-01-17 14:37:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2021-06-23 13:48:00",
                        "date_to": "2023-01-17 14:37:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.1.01-210527"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2021-06-23 13:48:00",
                        "date_to": "2023-01-17 14:37:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2021-06-23 13:48:00",
                        "date_to": "2023-01-17 14:37:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Board revision TRE_G3TH_5",
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2023-01-17 14:38:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2023-01-17 14:38:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAVAD TRE_G3TH DELTA"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2023-01-17 14:38:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "202"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2023-01-17 14:38:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO+GAL"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2023-01-17 14:38:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "4.2.01-220630"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2023-01-17 14:38:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2023-01-17 14:38:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NaN"
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1999-01-02 00:00:00",
                "date_to": "2003-04-10 23:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "AOAD\/M_T"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "unknown"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BPA"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1999-01-02 00:00:00",
                "date_to": "2003-04-10 23:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NONE"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1999-01-02 00:00:00",
                        "date_to": "2003-04-10 23:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2005-03-10 00:00:00",
                "date_to": "2010-12-08 12:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NOV503+CR"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7241"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BCR"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2005-03-10 00:00:00",
                "date_to": "2010-12-08 12:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "SPKE"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": "2010-12-08 12:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2010-12-09 00:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "JAV_RINGANT_G3T"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "334"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BAM"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0.1206,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2010-12-09 00:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "NONE"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2010-12-09 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": null,
                "contact_as_owner": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz-potsdam.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "GFZ",
                        "address": "Telegrafenberg A17\nD-14473 Potsdam\nGermany",
                        "infos": "",
                        "name": "GFZ Helmholtz Centre for Geosciences",
                        "www": ""
                    },
                    "comment": "",
                    "email": "gnss@gfz.de",
                    "name": "GFZ Network Operator",
                    "phone": "",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2005-03-10 00:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "INTERNAL"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2005-03-10 00:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        }
    ],
    "station_networks": [
        {
            "name": "EPOS"
        },
        {
            "name": "GFZ"
        }
    ],
    "station_type": "GNSS Continuous"
}