Australian National Gravity Compilation 2019 with Airborne DGIR 1VD Image

Australia and its continental margins are covered by a gravity anomaly grid derived from approximately 1.8 million observations. The grid, with a cell size of about 435 meters, combines ground, airborne, and offshore data from the 1940s to 2019. Geoscience Australia produced this first vertical derivative image from de-trended global isostatic residual anomalies.

Use Cases

• Map subsurface geological structures based on gravity anomaly data.
• Enhance mineral exploration targeting using high-resolution airborne gravity and gradiometry data.
• Model crustal thickness and isostatic compensation based on the de-trended global isostatic residual (DGIR) grid.
• Integrate gravity data with other geophysical datasets for regional geological interpretation.

Strengths

• Integrates approximately 1.8 million observations from ground, airborne (345,000 line-km gravity, 106,000 line-km gradiometry), and offshore sources.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Provides high spatial resolution with ground station spacing down to <1 km and airborne line spacing from 0.5 to 2.5 km.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data freshness should be verified as the underlying compilation is from September 2019.

Provenance

Source

Geoscience Australia, Commonwealth/State/Territory Governments, mining industry, universities, and research organisations.

Collection Method

Processed from the Australian National Gravity Database and global grids, applying isostatic and trend corrections followed by a Fourier transform.

Time Range

1940s to 2019

Freshness

Last updated 2026-03-25 16:59:51.253729; underlying data compiled as of September 2019.

Geography

Australia and its continental margins