{
    "cdp_num": null,
    "comment": "The antenna is 7.5 m above\r\nthe ground.\r\nIGS Reference Frame Station in the\r\nGeodetical Observatory Wettzell.\r\nIn addition and parallel an\r\nASHTECH Z12T Metronome GPS Receiver,\r\nFour character ID WTZA, on pillar 1204,\r\nDomes No. 14201M013, a JAVAD TRE_G3TH DELTA\r\nGPS+GLONASS Receiver, Four character\r\nID WTZZ, on pillar 1205, Domes No.\r\n14201M014, a JPS LEGACY GPS+GLONASS\r\nReceiver, Four character ID WT21,\r\non pillar 21, DOMES No. 14201M021,\r\nand a SEPT POLARX2 GPS Receiver,\r\nFour character ID WTZS, DOMES No.\r\n14201M015 are observing.\r\nPrior we observed here in the\r\nGeodetical Observatory Wettzell with a\r\nTI-4100, a MiniMac 2816 AT, a\r\nRogue SNR-800, our # 1200, Four Character\r\nID WETT, Domes No. 14201M009,\r\na 3SNAV R101 GPS+GLONASS\r\nReceiver, Four character ID WTZG,\r\non pillar 1203, Domes No.\r\n14201M012, a TRIMBLE 4000 SSI,\r\nFour character ID WTZT, on pillar 1201,\r\nDomes No. 14201M011, a JPS LEGACY\r\nGPS+GLONASS Receiver, Four character\r\nID WTZJ,on pillar 1203, DOMES No.\r\n14201M012, a TPS NETG3 GPS+GLONASS Receiver\r\nFour character ID WTZL, on pillar 1206,\r\nDomes No. 14201M022.\r\nFurther informations and effective\r\ndates see section 5 and 7.",
    "conditions": [],
    "country": "Germany",
    "country_code_ISO": "DEU",
    "date_from": "1995-02-09 00:00:00",
    "date_to": null,
    "description": "STEEL REFERENCE SURVEY MARKER 1202",
    "geological": {
        "bedrock": {
            "condition": "WEATHERED",
            "type": null
        },
        "characteristic": "Bedrock",
        "distance_to_fault": null,
        "fault_zone": "NO",
        "fracture_spacing": null
    },
    "iers_domes": "14201M010",
    "instrument_collocation": [
        {
            "comment": "",
            "date_from": "1977-01-01 00:00:00",
            "date_to": "1991-12-31 00:00:00",
            "status": "PERMANENT",
            "type": "SLR 7834"
        },
        {
            "comment": "",
            "date_from": "1983-01-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "VLBI 7224"
        },
        {
            "comment": "",
            "date_from": "1984-01-01 00:00:00",
            "date_to": "1997-12-31 00:00:00",
            "status": "MOBILE",
            "type": "SLR MTLRS 1"
        },
        {
            "comment": "",
            "date_from": "1984-01-01 00:00:00",
            "date_to": "1993-12-31 00:00:00",
            "status": "PERMANENT",
            "type": "TRANSIT NNSS-DMA DOPPLER"
        },
        {
            "comment": "CIGNET GPS Station",
            "date_from": "1987-11-12 00:00:00",
            "date_to": "1989-07-27 00:00:00",
            "status": "PERMANENT",
            "type": "TI-4100 GPS"
        },
        {
            "comment": "",
            "date_from": "1988-01-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "SLR WLRS 8834"
        },
        {
            "comment": "",
            "date_from": "1989-01-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "SUPER CONDUCTING GRAVIMETER"
        },
        {
            "comment": "CIGNET GPS Station",
            "date_from": "1989-05-23 00:00:00",
            "date_to": "1991-07-23 00:00:00",
            "status": "PERMANENT",
            "type": "MINIMAC 2816 AT GPS"
        },
        {
            "comment": "",
            "date_from": "1991-01-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "VERY BROAD BAND SEISMOGRAPH"
        },
        {
            "comment": "",
            "date_from": "1991-01-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "LLR WLRS"
        },
        {
            "comment": "CIGNET \/ CORE \/ IGS Station",
            "date_from": "1991-07-23 00:00:00",
            "date_to": "1997-02-02 00:00:00",
            "status": "PERMANENT",
            "type": "ROGUE SNR-800 GPS WETT # 1200"
        },
        {
            "comment": "",
            "date_from": "1994-01-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "PRARE"
        },
        {
            "comment": "TIGO Transportable Integrated Geodetic\r\nObservatory",
            "date_from": "1997-01-01 00:00:00",
            "date_to": "2001-12-01 00:00:00",
            "status": "MOBILE",
            "type": "TIGO SLR"
        },
        {
            "comment": "TIGO Transportable Integrated Geodetic\r\nObservatory",
            "date_from": "1997-01-01 00:00:00",
            "date_to": "2001-12-01 00:00:00",
            "status": "MOBILE",
            "type": "TIGO VLBI"
        },
        {
            "comment": "",
            "date_from": "1997-02-06 00:00:00",
            "date_to": "2005-05-17 00:00:00",
            "status": "PERMANENT",
            "type": "TRIMBLE 4000 SSI GPS WTZT # 1201"
        },
        {
            "comment": "",
            "date_from": "1997-11-25 00:00:00",
            "date_to": "2001-11-08 00:00:00",
            "status": "PERMANENT",
            "type": "ASHTECH Z-XII3 GPS WTZA # 1204"
        },
        {
            "comment": "",
            "date_from": "1998-10-14 00:00:00",
            "date_to": "1999-09-04 00:00:00",
            "status": "PERMANENT",
            "type": "3SNAV R101 OLD GPS+GLONASS WTZG # 1203"
        },
        {
            "comment": "",
            "date_from": "1999-02-01 00:00:00",
            "date_to": "2003-06-10 00:00:00",
            "status": "PERMANENT",
            "type": "ASHTECH Z-18 GPS+GLONASS WTZZ #1205"
        },
        {
            "comment": "",
            "date_from": "2001-07-03 00:00:00",
            "date_to": "2010-10-27 00:00:00",
            "status": "PERMANENT",
            "type": "JPS LEGACY GPS+GLONASS WTZJ #1203"
        },
        {
            "comment": "",
            "date_from": "2001-09-01 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "RINGLASER GYROSCOPE"
        },
        {
            "comment": "",
            "date_from": "2001-11-08 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "ASHTECH Z-XII3T GPS WTZA # 1204"
        },
        {
            "comment": "",
            "date_from": "2003-06-10 00:00:00",
            "date_to": "2003-11-06 00:00:00",
            "status": "PERMANENT",
            "type": "JPS LEGACY GPS+GLONASS WTZZ #1205"
        },
        {
            "comment": "",
            "date_from": "2003-10-14 00:00:00",
            "date_to": "2009-05-12 00:00:00",
            "status": "PERMANENT",
            "type": "ASHTECH Z-XII3 GPS WT21 #21"
        },
        {
            "comment": "",
            "date_from": "2003-11-06 00:00:00",
            "date_to": "2005-05-04 00:00:00",
            "status": "PERMANENT",
            "type": "JPS E_GGD GPS+GLONASS WTZZ #1205"
        },
        {
            "comment": "",
            "date_from": "2004-03-23 00:00:00",
            "date_to": "2007-09-05 00:00:00",
            "status": "PERMANENT",
            "type": "LEICA GRX1200PRO GPS WTZL #1206"
        },
        {
            "comment": "",
            "date_from": "2005-05-04 00:00:00",
            "date_to": "2011-02-15 00:00:00",
            "status": "PERMANENT",
            "type": "TPS E_GGD GPS+GLONASS WTZZ #1205"
        },
        {
            "comment": "",
            "date_from": "2005-07-27 00:00:00",
            "date_to": "2016-03-03 00:00:00",
            "status": "PERMANENT",
            "type": "SEPT POLARX2 GPS WTZS"
        },
        {
            "comment": "",
            "date_from": "2007-09-05 00:00:00",
            "date_to": "2008-01-25 00:00:00",
            "status": "PERMANENT",
            "type": "LEICA GRX1200GGPRO GPS+GLONASS WTZL #1206"
        },
        {
            "comment": "",
            "date_from": "2008-01-25 00:00:00",
            "date_to": "2008-09-18 00:00:00",
            "status": "PERMANENT",
            "type": "TPS NETG3 GPS+GLONASS WTZL #1206"
        },
        {
            "comment": "",
            "date_from": "2009-05-12 00:00:00",
            "date_to": "2009-05-25 00:00:00",
            "status": "PERMANENT",
            "type": "JPS LEGACY GPS+GLONASS WT21 #21"
        },
        {
            "comment": "",
            "date_from": "2009-05-25 00:00:00",
            "date_to": "2010-10-27 00:00:00",
            "status": "PERMANENT",
            "type": "TPS NETG3 GPS+GLONASS WT21 #21"
        },
        {
            "comment": "",
            "date_from": "2010-10-27 00:00:00",
            "date_to": "2015-04-27 00:00:00",
            "status": "PERMANENT",
            "type": "JPS LEGACY GPS+GLONASS WT21 #21"
        },
        {
            "comment": "",
            "date_from": "2011-02-15 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "JAVAD TRE_G3TH DELTA GPS+GLONASS WTZZ #1205"
        },
        {
            "comment": "",
            "date_from": "2016-03-03 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "SEPT POLARX4TR GPS+GLO+GAL+SBAS WTZS"
        },
        {
            "comment": "",
            "date_from": "2016-09-27 00:00:00",
            "date_to": null,
            "status": "PERMANENT",
            "type": "DORIS"
        }
    ],
    "local_ties": [
        {
            "accuracy": 1,
            "comment": null,
            "cpd_num": "7224",
            "date_at": "1995-02-13 15:00:00",
            "dx": -2.105,
            "dy": -0.981,
            "dz": 1.994,
            "iers_domes": "14201M009",
            "name": "1200 ROGUE SNR-800 = WETT",
            "survey_method": "TRIANGULATION",
            "usage": "GPS"
        },
        {
            "accuracy": 1,
            "comment": null,
            "cpd_num": "8834",
            "date_at": "2004-10-01 10:00:00",
            "dx": -40.797,
            "dy": -118.396,
            "dz": 61.321,
            "iers_domes": "14201S004",
            "name": "VLBI Ref Point",
            "survey_method": "TRIANGULATION",
            "usage": "VLBI"
        },
        {
            "accuracy": 1,
            "comment": null,
            "cpd_num": "7593",
            "date_at": "2004-10-01 10:00:00",
            "dx": -3.824,
            "dy": -68.202,
            "dz": 15.518,
            "iers_domes": "14201S018",
            "name": "SLR WLRS",
            "survey_method": "TRIANGULATION",
            "usage": "SLR"
        },
        {
            "accuracy": 1,
            "comment": "The complete CDP number is 759324012",
            "cpd_num": "7594",
            "date_at": "2004-10-01 10:00:00",
            "dx": -8.897,
            "dy": -98.742,
            "dz": 15.251,
            "iers_domes": "14201S100",
            "name": "TIGO VLBI",
            "survey_method": "TRIANGULATION",
            "usage": "VLBI"
        },
        {
            "accuracy": 2,
            "comment": "The complete CDP number is 75947901",
            "cpd_num": null,
            "date_at": "2004-10-01 10:00:00",
            "dx": 14.357,
            "dy": -120.708,
            "dz": -0.482,
            "iers_domes": "14201M200",
            "name": "TIGO SLR",
            "survey_method": "TRIANGULATION",
            "usage": "SLR"
        },
        {
            "accuracy": null,
            "comment": null,
            "cpd_num": null,
            "date_at": "2004-10-01 10:00:00",
            "dx": -3.071,
            "dy": 1.622,
            "dz": 2.157,
            "iers_domes": "14201M011",
            "name": "1201 TRIMBLE 4000SSI = WTZT",
            "survey_method": "TRIANGULATION",
            "usage": "GPS"
        },
        {
            "accuracy": null,
            "comment": "Also a 3SNAV R 101 GPS+GLONASS 1998\r\nand 1999",
            "cpd_num": null,
            "date_at": "2004-10-01 10:00:00",
            "dx": -0.666,
            "dy": 1.569,
            "dz": 0.128,
            "iers_domes": "14201M012",
            "name": "1203 JPS LEGACY = WTZJ",
            "survey_method": "TRIANGULATION",
            "usage": "GPS+GLONASS"
        },
        {
            "accuracy": null,
            "comment": "Prior an ASHTECH Z-XII3\r\noperated",
            "cpd_num": null,
            "date_at": "2004-10-01 10:00:00",
            "dx": -2.191,
            "dy": -1.002,
            "dz": 1.892,
            "iers_domes": "14201M013",
            "name": "1204 ASHTECH Z-XII3T = WTZA",
            "survey_method": "TRIANGULATION",
            "usage": "GPS"
        },
        {
            "accuracy": null,
            "comment": "Prior an ASHTECH Z18,a JPS LEGACY,\r\na JPS E_GGD, a TPS E_GGD operated",
            "cpd_num": null,
            "date_at": "2004-10-01 10:00:00",
            "dx": -1.123,
            "dy": -0.687,
            "dz": 0.906,
            "iers_domes": "14201M014",
            "name": "1205 JAVAD TRE_G3TH DELTA = WTZZ",
            "survey_method": "TRIANGULATION",
            "usage": "GPS+GLO+GAL+BDS+SBAS"
        },
        {
            "accuracy": null,
            "comment": null,
            "cpd_num": null,
            "date_at": "2004-10-01 10:00:00",
            "dx": -2.643,
            "dy": 0.307,
            "dz": 2.026,
            "iers_domes": "14201M022",
            "name": "1206 TPS NETG3 = WTZL",
            "survey_method": "TRIANGULATION",
            "usage": "GPS+GLONASS"
        }
    ],
    "location": {
        "city": "Bad Koetzting",
        "coordinates": {
            "X": 4075580.685,
            "Y": 931853.66,
            "Z": 4801568.054,
            "altitude": 666,
            "lat": 49.144197311786456,
            "lon": 12.878907524568339
        },
        "country": "Germany",
        "country_iso_code": "DEU",
        "description": "",
        "state": "Bavaria",
        "tectonic": {
            "plate_name": "EURASIAN"
        }
    },
    "logs": {
        "contact": "GOW Operator (gnss_wtz@bkg.bund.de)",
        "date": "2023-10-30 00:00:00",
        "log_type": "UPDATE",
        "modified": "UNAVAILABLE",
        "previous": "UNAVAILABLE",
        "title": "WTZR00DEU.xml"
    },
    "marker": "WTZR",
    "monument": {
        "description": "STEEL PLATE ON CONCRETE SURVEY TOWER",
        "foundation": "SCREW ANCHORED TO CONCRETE SURVEY TOWER",
        "foundation_depth": null,
        "height": 0.8,
        "monument_inscription": "Pillar 1202"
    },
    "monument_num": 0,
    "name": "Wettzell \/ Germany",
    "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": "gnss_wtz@bkg.bund.de",
                "name": "GOW Operator",
                "phone": "+49 9941 6030",
                "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "1995-02-09 00:00:00",
                "date_to": "1995-04-04 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "1995-02-09 00:00:00",
                        "date_to": "1995-04-04 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ROGUE SNR-8000"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1995-02-09 00:00:00",
                        "date_to": "1995-04-04 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "T313"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "1995-02-09 00:00:00",
                        "date_to": "1995-04-04 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "1995-02-09 00:00:00",
                        "date_to": "1995-04-04 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.0"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "1995-02-09 00:00:00",
                        "date_to": "1995-04-04 00:00:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "1995-02-09 00:00:00",
                        "date_to": "1995-04-04 00:00:00",
                        "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "1995-04-04 00:00:00",
                "date_to": "1996-01-15 09:05:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "1995-04-04 00:00:00",
                        "date_to": "1996-01-15 09:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "ROGUE SNR-8000"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "1995-04-04 00:00:00",
                        "date_to": "1996-01-15 09:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "T322"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "1995-04-04 00:00:00",
                        "date_to": "1996-01-15 09:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "1995-04-04 00:00:00",
                        "date_to": "1996-01-15 09:05:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "3.0"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "1995-04-04 00:00:00",
                        "date_to": "1996-01-15 09:05:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "1995-04-04 00:00:00",
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                        "value_date": null,
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                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2008-01-25 08:00:00",
                        "date_to": "2008-01-28 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "355315"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2008-01-25 08:00:00",
                        "date_to": "2008-01-28 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2008-01-25 08:00:00",
                        "date_to": "2008-01-28 12:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "5.60"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2008-01-25 08:00:00",
                        "date_to": "2008-01-28 12:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2008-01-25 08:00:00",
                        "date_to": "2008-01-28 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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2008-01-28 13:00:00",
                "date_to": "2008-07-22 11:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2008-01-28 13:00:00",
                        "date_to": "2008-07-22 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2008-01-28 13:00:00",
                        "date_to": "2008-07-22 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "355315"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2008-01-28 13:00:00",
                        "date_to": "2008-07-22 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2008-01-28 13:00:00",
                        "date_to": "2008-07-22 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "5.62"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2008-01-28 13:00:00",
                        "date_to": "2008-07-22 11:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2008-01-28 13:00:00",
                        "date_to": "2008-07-22 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "receiver"
                }
            }
        },
        {
            "item": {
                "comment": "Prior 2009-01-29 the\r\nReceiver identified the\r\nFirmware Version with 6.00\r\nin the RINEX Headers.\r\nAfter 2009-01-29 the\r\nReceiver identified the\r\nFirmware Version with\r\n6.00\/3.015.",
                "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2008-07-22 12:00:00",
                "date_to": "2009-02-03 11:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2008-07-22 12:00:00",
                        "date_to": "2009-02-03 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2008-07-22 12:00:00",
                        "date_to": "2009-02-03 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "355315"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2008-07-22 12:00:00",
                        "date_to": "2009-02-03 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2008-07-22 12:00:00",
                        "date_to": "2009-02-03 11:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "6.00\/3.015"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2008-07-22 12:00:00",
                        "date_to": "2009-02-03 11:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2008-07-22 12:00:00",
                        "date_to": "2009-02-03 11:59:00",
                        "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2009-02-03 12:00:00",
                "date_to": "2009-02-04 08:59:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2009-02-03 12:00:00",
                        "date_to": "2009-02-04 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2009-02-03 12:00:00",
                        "date_to": "2009-02-04 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "355315"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2009-02-03 12:00:00",
                        "date_to": "2009-02-04 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2009-02-03 12:00:00",
                        "date_to": "2009-02-04 08:59:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7.00\/3.015"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2009-02-03 12:00:00",
                        "date_to": "2009-02-04 08:59:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2009-02-03 12:00:00",
                        "date_to": "2009-02-04 08:59:00",
                        "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2009-02-04 09:00:00",
                "date_to": "2009-02-04 13:29:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2009-02-04 09:00:00",
                        "date_to": "2009-02-04 13:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2009-02-04 09:00:00",
                        "date_to": "2009-02-04 13:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "355315"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2009-02-04 09:00:00",
                        "date_to": "2009-02-04 13:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2009-02-04 09:00:00",
                        "date_to": "2009-02-04 13:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7.00\/3.016"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2009-02-04 09:00:00",
                        "date_to": "2009-02-04 13:29:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2009-02-04 09:00:00",
                        "date_to": "2009-02-04 13:29:00",
                        "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2009-02-04 13:30:00",
                "date_to": "2009-04-22 06:14:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2009-02-04 13:30:00",
                        "date_to": "2009-04-22 06:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2009-02-04 13:30:00",
                        "date_to": "2009-04-22 06:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "355315"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2009-02-04 13:30:00",
                        "date_to": "2009-04-22 06:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2009-02-04 13:30:00",
                        "date_to": "2009-04-22 06:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7.01\/3.016"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2009-02-04 13:30:00",
                        "date_to": "2009-04-22 06:14:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2009-02-04 13:30:00",
                        "date_to": "2009-04-22 06:14:00",
                        "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2009-04-22 06:15:00",
                "date_to": "2009-04-28 14:29:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2009-04-22 06:15:00",
                        "date_to": "2009-04-28 14:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
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                        "date_to": "2009-04-28 14:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "355315"
                    },
                    {
                        "attribute": {
                            "name": "satellite_system"
                        },
                        "date_from": "2009-04-22 06:15:00",
                        "date_to": "2009-04-28 14:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2009-04-22 06:15:00",
                        "date_to": "2009-04-28 14:29:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7.01\/3.017"
                    },
                    {
                        "attribute": {
                            "name": "elevation_cutoff_setting"
                        },
                        "date_from": "2009-04-22 06:15:00",
                        "date_to": "2009-04-28 14:29:00",
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "temperature_stabilization"
                        },
                        "date_from": "2009-04-22 06:15:00",
                        "date_to": "2009-04-28 14:29:00",
                        "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
                    "agency": {
                        "abbreviation": "BKG",
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                        "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": "2009-04-28 14:30:00",
                "date_to": "2009-06-30 14:14:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "receiver_type"
                        },
                        "date_from": "2009-04-28 14:30:00",
                        "date_to": "2009-06-30 14:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEICA GRX1200GGPRO"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2009-04-28 14:30:00",
                        "date_to": "2009-06-30 14:14:00",
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                        "value_varchar": "355315"
                    },
                    {
                        "attribute": {
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                        "date_from": "2009-04-28 14:30:00",
                        "date_to": "2009-06-30 14:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "GPS+GLO"
                    },
                    {
                        "attribute": {
                            "name": "firmware_version"
                        },
                        "date_from": "2009-04-28 14:30:00",
                        "date_to": "2009-06-30 14:14:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "7.50\/3.017"
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                    "phone": "+49 69 6333274",
                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "2010-06-30 08:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "antenna_type"
                        },
                        "date_from": "2010-06-30 08:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEIAR25.R3"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2010-06-30 08:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "10020031"
                    },
                    {
                        "attribute": {
                            "name": "antenna_reference_point"
                        },
                        "date_from": "2010-06-30 08:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "BPA"
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_up_ecc"
                        },
                        "date_from": "2010-06-30 08:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0.071,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_north_ecc"
                        },
                        "date_from": "2010-06-30 08:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "marker_arp_east_ecc"
                        },
                        "date_from": "2010-06-30 08:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "alignment_from_true_n"
                        },
                        "date_from": "2010-06-30 08:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 0,
                        "value_varchar": null
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_type"
                        },
                        "date_from": "2010-06-30 08:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "RG 214"
                    },
                    {
                        "attribute": {
                            "name": "antenna_cable_length"
                        },
                        "date_from": "2010-06-30 08:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": 30,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "antenna"
                }
            }
        },
        {
            "item": {
                "comment": "Antenna calibrated absolute\r\nby Geo+++ GmbH Garbsen, 2010-04-29.",
                "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2010-06-30 08:00:00",
                "date_to": null,
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "radome_type"
                        },
                        "date_from": "2010-06-30 08:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "LEIT"
                    },
                    {
                        "attribute": {
                            "name": "serial_number"
                        },
                        "date_from": "2010-06-30 08:00:00",
                        "date_to": null,
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "radome"
                }
            }
        },
        {
            "item": {
                "comment": "Rogue SNR-8000 and AOA SNR-8000 ACT\r\nused H-Maser for external input\r\nreference oscillator. H-Masers\r\nEFOS 1 or EFOS 3 or EFOS 13.",
                "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "1983-01-01 00:00:00",
                "date_to": "2002-06-24 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "1983-01-01 00:00:00",
                        "date_to": "2002-06-24 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "EXTERNAL H-MASER"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "1983-01-01 00:00:00",
                        "date_to": "2002-06-24 00:00:00",
                        "value_date": null,
                        "value_numeric": 5,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "AOA SNR-8000 ACT used H-Maser\r\nfor external input reference\r\noscillator. H-Maser EFOS 13.",
                "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2002-06-24 00:00:00",
                "date_to": "2002-11-13 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2002-06-24 00:00:00",
                        "date_to": "2002-11-13 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "EXTERNAL H-MASER EFOS 13"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2002-06-24 00:00:00",
                        "date_to": "2002-11-13 00:00:00",
                        "value_date": null,
                        "value_numeric": 5,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "AOA SNR-8000 ACT used H-Maser\r\nfor external input reference\r\noscillator. H-Maser EFOS 1.",
                "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2002-11-13 00:00:00",
                "date_to": "2002-12-19 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2002-11-13 00:00:00",
                        "date_to": "2002-12-19 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "EXTERNAL H-MASER EFOS 1"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2002-11-13 00:00:00",
                        "date_to": "2002-12-19 00:00:00",
                        "value_date": null,
                        "value_numeric": 5,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "AOA SNR-8000 ACT use H-Maser\r\nfor external input reference\r\noscillator. H-Maser EFOS 18.",
                "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2002-12-19 00:00:00",
                "date_to": "2005-12-01 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2002-12-19 00:00:00",
                        "date_to": "2005-12-01 00:00:00",
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                        "value_numeric": null,
                        "value_varchar": "EXTERNAL H-MASER EFOS 18"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2002-12-19 00:00:00",
                        "date_to": "2005-12-01 00:00:00",
                        "value_date": null,
                        "value_numeric": 5,
                        "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
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                "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": "2005-12-01 00:00:00",
                "date_to": "2006-05-24 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2005-12-01 00:00:00",
                        "date_to": "2006-05-24 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "INTERNAL"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2005-12-01 00:00:00",
                        "date_to": "2006-05-24 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "Use H-Maser for external\r\ninput reference oscillator.\r\nH-Maser EFOS 18.",
                "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2006-05-24 00:00:00",
                "date_to": "2008-09-16 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
                        },
                        "date_from": "2006-05-24 00:00:00",
                        "date_to": "2008-09-16 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "EXTERNAL H-MASER EFOS 18"
                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
                        },
                        "date_from": "2006-05-24 00:00:00",
                        "date_to": "2008-09-16 00:00:00",
                        "value_date": null,
                        "value_numeric": 5,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "Use H-Maser for external\r\ninput reference oscillator.\r\nH-Maser EFOS 39.",
                "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2008-09-16 00:00:00",
                "date_to": "2009-01-26 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
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                        "date_from": "2008-09-16 00:00:00",
                        "date_to": "2009-01-26 00:00:00",
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                    {
                        "attribute": {
                            "name": "input_frequency"
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                        "date_from": "2008-09-16 00:00:00",
                        "date_to": "2009-01-26 00:00:00",
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                        "value_numeric": 5,
                        "value_varchar": null
                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
                }
            }
        },
        {
            "item": {
                "comment": "Use H-Maser for external\r\ninput reference oscillator.\r\nH-Maser EFOS 18.",
                "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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": "2009-01-26 00:00:00",
                "date_to": "2010-04-30 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
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                        "date_from": "2009-01-26 00:00:00",
                        "date_to": "2010-04-30 00:00:00",
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                    },
                    {
                        "attribute": {
                            "name": "input_frequency"
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                        "date_from": "2009-01-26 00:00:00",
                        "date_to": "2010-04-30 00:00:00",
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                    }
                ],
                "item_type": {
                    "name": "frequency_standard"
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            }
        },
        {
            "item": {
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                "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "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",
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                },
                "date_from": "2010-04-30 00:00:00",
                "date_to": "2010-07-07 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "standard_type"
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                        "date_from": "2010-04-30 00:00:00",
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                        "value_varchar": "INTERNAL"
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                    {
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                ],
                "item_type": {
                    "name": "frequency_standard"
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            }
        },
        {
            "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": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
                    "role": "site_owner",
                    "title": ""
                },
                "contact_as_producer": {
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                        "abbreviation": "BKG",
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                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
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                    "role": "metadata_custodian",
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                "item_type": {
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                ],
                "item_type": {
                    "name": "frequency_standard"
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            }
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        {
            "item": {
                "comment": null,
                "contact_as_owner": {
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                        "abbreviation": "BKG",
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                    "comment": "",
                    "email": "gnss_wtz@bkg.bund.de",
                    "name": "GOW Operator",
                    "phone": "+49 9941 6030",
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                "contact_as_producer": {
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                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
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                    "role": "metadata_custodian",
                    "title": ""
                },
                "date_from": "1987-01-01 00:00:00",
                "date_to": "2008-07-22 00:00:00",
                "item_attributes": [
                    {
                        "attribute": {
                            "name": "sensor_model"
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                        "date_from": "1987-01-01 00:00:00",
                        "date_to": "2008-07-22 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "809"
                    },
                    {
                        "attribute": {
                            "name": "manufacturer"
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                        "date_from": "1987-01-01 00:00:00",
                        "date_to": "2008-07-22 00:00:00",
                        "value_date": null,
                        "value_numeric": null,
                        "value_varchar": "Lamprecht, Goettingen"
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                    {
                        "attribute": {
                            "name": "serial_number"
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                        "date_to": "2008-07-22 00:00:00",
                        "value_date": null,
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                    {
                        "attribute": {
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                    {
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                        "value_numeric": 1.5,
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                    },
                    {
                        "attribute": {
                            "name": "aspiration"
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                    {
                        "attribute": {
                            "name": "height_diff_to_ant"
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                        "date_from": "1987-01-01 00:00:00",
                        "date_to": "2008-07-22 00:00:00",
                        "value_date": null,
                        "value_numeric": 0,
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                    },
                    {
                        "attribute": {
                            "name": "calibration_date"
                        },
                        "date_from": "1987-01-01 00:00:00",
                        "date_to": "2008-07-22 00:00:00",
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                ],
                "item_type": {
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            }
        },
        {
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                "contact_as_owner": {
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                    "email": "gnss_wtz@bkg.bund.de",
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                "contact_as_producer": {
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                    },
                    "comment": "",
                    "email": "bkg-gdc@bkg.bund.de",
                    "name": "BKG GNSS Data Center",
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                "date_from": "2008-07-22 00:00:00",
                "date_to": null,
                "item_attributes": [
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                    {
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}