a7eaaf20-5b9d-4539-bb99-400865081005 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T05:17:41 creation ISO 19115 2016 GA GNSS-derived Tropospheric Data Products a7eaaf20-5b9d-4539-bb99-400865081005 Geoscience Australia (GA) provides tropospheric Zenith Total Delay (ZTD) products in near-real-time (hourly) as well as on a daily basis. These delays are derived from Global Navigation Satellite System (GNSS) signals measured at Continuously Operated Reference Sites (CORS) across multiple networks including the Australian Regional GNSS Network (ARGN), the Asia-Pacific Reference Frame (APREF), the South Pacific Regional GNSS Network (SPRGN), and the International GNSS Service (IGS). Data from these continuous stations are accessed from the Australian National Positioning Infrastructure Data Collection. GA operates as an analysis center of the European Meteorological Services Network (EUMETNET) Economic Interest Group (EIG) GNSS water vapour programme (E-GVAP, https://egvap.dmi.dk/). GA GNSS derived troposphere data products are provided to E-GVAP, Australian Bureau of Meteorology (BoM) and the United Kingdom's Meteorological Office (UK Met Office). {"type": "Polygon", "coordinates": [[[45.0, -90.0], [168.0, -90.0], [168.0, -9.0], [45.0, -9.0], [45.0, -90.0]]]} 45.0 168.0 -90.0 -9.0 CRCSI GNSS GPS Geodesy Global Navigation Satellite Systems Global Positioning System HVC_144503 Meteorology Published_External Troposphere delay Weather forecasting ZTD Zenith Total Delay Link to data documentDigital Link to data HTML