National Gravity Compilation 2019 DGIR Grid for Australia

A geospatial grid of de-trended global isostatic residual gravity anomalies covering Australia and its continental margins. The grid is derived from nearly 1.4 million gravity stations in the Australian National Gravity Database and marine data, with a cell size of approximately 435 meters. Data were compiled by Geoscience Australia from observations collected by government, industry, and research organizations from the 1940s to September 2019.

Use Cases

• Model subsurface geological structures based on gravity anomaly patterns.
• Support mineral and resource exploration by identifying density contrasts in the crust.
• Integrate with magnetic or seismic datasets for regional geophysical interpretation.
• Calibrate or validate satellite-derived gravity models using ground-based observations.

Strengths

• Derived from a substantial base of nearly 1.4 million gravity stations.
• Grid cell size of 0.00417 degrees (approximately 435m) provides regional detail.
• Data quality was checked by GA geophysicists to ensure fitness-for-purpose.
• Incorporates decades of observations from the 1940s to 2019.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Station spacing for ground observations varies from 11 km to less than 1 km, indicating uneven spatial resolution.

Provenance

Source

Geoscience Australia (GA), Australian Ocean Data Network.

Collection Method

Processed from ground observations in the Australian National Gravity Database and offshore data from the Scripps Institution of Oceanography Global Gravity grid.

Time Range

Observations from the 1940s to September 2019.

Freshness

Last updated 2026-04-10 17:42:26.794727; freshness should be verified.

Geography

Australia and its continental margins.