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Marine Gravity, Magnetic and Bathymetry Levelled Line Data in the Australian Region

Created 26/03/2026

Updated 26/03/2026

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This compilation of gravity, magnetic and bathymetry ship-track line data, derived from the Geoscience Australia marine geophysical survey database 'Mardat', has been levelled in preparation for gridding. Data are included from Geoscience Australia geophysical surveys acquired since the 1970's as well as surveys from other institutions. The levelling process reduces mis ties between intersecting surveys of various vintages so that they can be integrated and represented as continuous surfaces.

The compilation consists of time-indexed ASCII fixed format files organised by survey with a record spacing approximately 150m. Each survey file contains geographic coordinates and the potential field and bathymetry data, both unlevelled (source data as in Mardat) and levelled. The compilation does not include shot-indexed data as may be recorded on seismic reflection surveys.

Note: The marine data was levelled by Desmond FitzGerald & Associates from 1998-2001, and Ron Hackney in 2009-2011. The final data were further reviewed by Yvette Poudjom Djomani prior to the release.

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Title Marine Gravity, Magnetic and Bathymetry Levelled Line Data in the Australian Region
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/6c54a58f-14df-4b41-926a-66845714cee7
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 01/05/2025
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        102.0,
        -52.0
      ],
      [
        172.0,
        -52.0
      ],
      [
        172.0,
        -8.0
      ],
      [
        102.0,
        -8.0
      ],
      [
        102.0,
        -52.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Data.gov.au