National Gravity Compilation 2019: Airborne DGIR Grid for Australia

The 2019 Australian National Gravity Grids B series includes data collected from the 1940s to 2019. It integrates nearly 1.4 million ground stations, 345,000 line km of airborne gravity, and 106,000 line km of airborne gravity gradiometry to produce a de-trended global isostatic residual anomaly grid at a 0.00417-degree cell size. The grid was compiled by Geoscience Australia using data from government, industry, and academic sources.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Enhancing resolution in areas with sparse ground data using integrated airborne gravity and gradiometry surveys.
• Mapping continental margins and crustal density variations based on the de-trended global isostatic residual anomalies.

Strengths

• Integrates approximately 1.8 million gravity observations from multiple sources.
• Grid cell size is 0.00417 degrees (approximately 435m), providing regional detail.
• Data quality was 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 data_gov_au.

Provenance

Source

Geoscience Australia (GA), Australian Ocean Data Network

Collection Method

Processed from ground observations in the Australian National Gravity Database (ANGD) and supplemented by offshore global gravity data and airborne surveys.

Time Range

1940s to 2019

Freshness

Last updated 2026-04-16 08:44:08.057123; freshness should be verified.

Geography

Australia and its continental margins