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Free-air anomaly and gravity maps of Australia - in colour, 1:25,000,000

Created 16/10/2025

Updated 16/10/2025

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On the following pages are a Free-air Anomaly Map of Australia and a Gravity Map of Australia (showing Bouguer anomalies on land and free-air anomalies at sea), both at a scale of 1:25 million. The Free-air Anomaly map is a smaller version of an unpublished map prepared as an overlay to the 1:2.5 million 1976 Geological Map of Australia; its projection is Simple Conic. The Gravity Map is a smaller version of the 1:5 million 1976 Gravity Map of Australia; its projection is Lambert Conformal. Both maps were prepared from the same data bank as the 1:5 million Gravity Map of Australia with the addition of some marine observations by the "Gulf Rex" which fill a large gap at the southern end of the Great Barrier Reef. Details of the sources of data, reduction of observations, accuracy of the anomalies, and techniques used for smoothing and contouring are contained in Anfiloff et al. (this issue). The maps were drawn by P. Moffat and A.J. Maxwell of BMRs Geophysical Drawing Office and printed by the Division of National Mapping, Department of National Resources.

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Additional Info

Field Value
Title Free-air anomaly and gravity maps of Australia - in colour, 1:25,000,000
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/68af65ae-6d64-4c47-a6d2-9b2219a2b101
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        104.0,
        -44.0
      ],
      [
        164.0,
        -44.0
      ],
      [
        164.0,
        -6.0
      ],
      [
        104.0,
        -6.0
      ],
      [
        104.0,
        -44.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Free-air anomaly and gravity maps of Australia - in colour, 1:25,000,000". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/free-air-anomaly-and-gravity-maps-of-australia-in-colour-1-25000000