Australian Gravity Grids with 400m Resolution, 2019

Over 1.8 million gravity observations from the Australian National Gravity Database, supplemented by offshore and airborne data, were used to produce these grids. Geoscience Australia and GNS Science created Free Air Anomaly, Complete Bouguer Anomaly, and De-trended Global Isostatic Residual grids at a 400-metre cell size. The grids combine ground, satellite, and airborne data collected from the 1940s to 2019.

Use Cases

• Modeling subsurface geology based on gravity anomaly values.
• Integrating gravity data with other geospatial datasets for regional analysis.
• Improving resolution in areas with sparse ground data using included airborne gravity gradiometry surveys.

Strengths

• Cell size of 400 metres, an improvement from previous 800-metre grids.
• Includes over 345,000 line km of Airborne Gravity Gradiometry data for better resolution.
• Combines onshore ground data with offshore satellite-derived gravity data for continental context.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Two DGIR grids were updated in October 2020, requiring users to check for the latest version.
• Data may reflect geographic bias inherent to data_gov_au, with station spacing varying across the continent.

Provenance

Source

Geoscience Australia and the Institute of Geological and Nuclear Sciences Limited (GNS Science)

Collection Method

Grids produced from the Australian National Gravity Database, airborne surveys, and the Global Gravity Grid from NOAA.

Time Range

1940s to 2019

Freshness

Last updated 2026-04-16 15:25:55.237711; freshness should be verified.

Geography

Australia (onshore and offshore)