6c2b93d4-3244-4612-a7d9-b593fd2fd02d urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T09:43:32 creation ISO 19115 2016 AUSGeoid98 v.1.0 data files: (sd55-02) 6c2b93d4-3244-4612-a7d9-b593fd2fd02d AUSGeoid98 data files contain a 2 minute grid of AUSGeoid98 data covering the Australian region, which you can use to interpolate geoid-ellipsoid separations for the positions required.You can use your own interpolation software, or you can use Geoscience Australia's Windows Interpolation software (Winter). The data files are text files in a standard format that cover the same area as standard topographic map areas. Files covering both 1:250,000 (approximately 100 x 150 km) and 1:1,000,000 (approximately 400 x 600 km) map areas are available. There is a 4 minute overlap on all sides of each area. Data format: AUSGeoid98 data files have a header record at the start of each file, to distinguish them from the superseded AUSGeoid93 data files. AUSGeoid98 data files show the geoid-ellipsoid separation to 3 decimal places, while the superseded AUSGeoid93 data files showed only 2 decimal places. AUSGeoid98 deflections of the vertical were computed from the geoid-ellipsoid separation surface, while the AUSGeoid93 deflections of the vertical were computed from OSU91A. {"type": "Polygon", "coordinates": [[[145.5, -13.0], [147.0, -13.0], [147.0, -12.0], [145.5, -12.0], [145.5, -13.0]]]} 145.5 147.0 -13.0 -12.0 AU AUSGeoid98 Geodesy Geodetic Data Published_External dataset geodesy Related Product documentDigital http://www.ga.gov.au/geodesy/ausgeoid/files.jsp HTML Download the data (.dat) documentDigital Download the data (.dat) ZIP Unnamed resource documentDigital HTML