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AUSGeoid98 v.1.0 data files: Cooktown (sd55)

Created 17/10/2025

Updated 17/10/2025

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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 Data format: AUSGeoid98 data files have a header record at the start of each file, to distinguish them from the superseded AUSGeoid93 data files. AUSGeoid98 data files show the geoid-ellipsoid separation to 3 decimal places, while the superseded AUSGeoid93 data files showed only 2 decimal places.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.

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Additional Info

Field Value
Title AUSGeoid98 v.1.0 data files: Cooktown (sd55)
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/858ee11a-b136-459d-b57e-f38363c88bea
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        144.0,
        -16.0
      ],
      [
        150.0,
        -16.0
      ],
      [
        150.0,
        -12.0
      ],
      [
        144.0,
        -12.0
      ],
      [
        144.0,
        -16.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "AUSGeoid98 v.1.0 data files: Cooktown (sd55)". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/ausgeoid98-v-1-0-data-files-cooktown-sd55