{ "cdp_num": null, "comment": "The GNSS antenna is mounted on a short mast on\r\nthe roof of Radio Kootwijk (nickname\r\n'Cathedral'), nearby, and in sight of, the\r\nformer Kootwijk Observatory for Satellite\r\nGeodesy (KOSG). The building is a very sturdy\r\nconcrete structure build in the 1930's to\r\nhouse long wave long distance radio\r\ntransmitters (now removed). The building is\r\nnowadays a protected monument.\r\nThe station is operating under responsibility\r\nof the AGRS.NL organisation (RWS\/KAD\/TUD)\r\nDutch triangulation RD site+marker 339352-02", "conditions": [], "country": "Netherlands", "country_code_ISO": "NLD", "date_from": "2013-05-23 00:00:00", "date_to": null, "description": "Bottom of the pin under the antenna mount", "geological": { "bedrock": { "condition": null, "type": "SEDIMENTARY" }, "characteristic": "SAND", "distance_to_fault": null, "fault_zone": "NO", "fracture_spacing": null }, "iers_domes": "13504M005", "instrument_collocation": [ { "comment": "", "date_from": "1973-01-01 00:00:00", "date_to": "2004-12-31 00:00:00", "status": "MOBILE", "type": "RELATIVE GRAVIMETERS" }, { "comment": "Micro-g FG-5 #234 (yearly)", "date_from": "1973-01-01 00:00:00", "date_to": null, "status": "MOBILE", "type": "ABSOLUTE GRAVIMETERS" }, { "comment": "", "date_from": "1973-01-01 00:00:00", "date_to": "1995-12-31 00:00:00", "status": "PERMANENT", "type": "SEISMOMETER" }, { "comment": "Regular occupations by MTLRS-2", "date_from": "1984-01-01 00:00:00", "date_to": "1996-12-31 00:00:00", "status": "MOBILE", "type": "SLR" }, { "comment": "", "date_from": "2013-05-23 00:00:00", "date_to": null, "status": "PERMANENT", "type": "UNDERGROUND LEVELING BENCHMARK" } ], "local_ties": [ { "accuracy": 5, "comment": "Provisional result from GPS data, local\r\nsurvey with triangulation, trilateration\r\nand levelling has been conducted. Results\r\nare pending.", "cpd_num": null, "date_at": "2013-06-27 00:00:00", "dx": -388.53, "dy": -630.93, "dz": 339.58, "iers_domes": "13504M003", "name": "KOSG-25", "survey_method": "GPS CAMPAIGN", "usage": "GPS (KOSG Permanent GPS)" } ], "location": { "city": "Kootwijk", "coordinates": { "X": 3899613.948, "Y": 397361.592, "Z": 5014738.666, "altitude": 104.8, "lat": 52.17335555543181, "lon": 5.818224999551541 }, "country": "Netherlands", "country_iso_code": "NLD", "description": "Near Apeldoorn", "state": "Gelderland", "tectonic": { "plate_name": "EURASIAN" } }, "logs": { "contact": "TU Delft GNSS team (gnss-citg@tudelft.nl)", "date": "2026-02-19 00:00:00", "log_type": "UPDATE", "modified": "UNAVAILABLE", "previous": "UNAVAILABLE", "title": "KOS100NLD.xml" }, "marker": "KOS1", "monument": { "description": "STEEL MAST", "foundation": "CONCRETE BUILDING", "foundation_depth": null, "height": 1.5, "monument_inscription": "None" }, "monument_num": 0, "name": "Kootwijk Observatory for 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