National Gravity Compilation 2019: DGIR 1VD Grid for Australia

A gravity anomaly grid for Australia and its continental margins derived from approximately 1.8 million observations. The grid combines ground, offshore, and airborne gravity data collected from the 1940s to 2019, processed to show the first vertical derivative of de-trended global isostatic residual anomalies. It was produced by Geoscience Australia from the Australian National Gravity Database and global sources.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Identify mineral exploration targets based on density variations revealed by the DGIR grid.
• Integrate gravity data with other geophysical surveys for regional geological studies.
• Study crustal thickness and isostatic compensation using the processed global isostatic residual anomalies.

Strengths

• Integrates nearly 1.4 million ground stations, 345,000 line km of airborne gravity, and 106,000 line km of airborne gravity gradiometry.
• Data spans a long temporal range, collected from the 1940s to 2019.
• Grid has a defined cell size of 0.00417 degrees (approximately 435m).
• Processed and quality-checked by GA geophysicists to be fit-for-purpose.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic bias inherent to the aggregation of multiple government and industry sources.

Provenance

Source

Australian Ocean Data Network, Geoscience Australia (GA), Scripps Institution of Oceanography, NOAA, NGA.

Collection Method

Data processed from the Australian National Gravity Database and global grids, with standard methods and FFT calculations.

Time Range

1940s to 2019 (with database snapshot as of September 2019).

Freshness

Last updated 2026-05-05 00:28:07.904788; freshness should be verified.

Geography

Australia and its continental margins.