National Gravity Compilation 2019: Airborne DGIR Image of Australia

Geoscience Australia's National Gravity Compilation 2019 includes a de-trended global isostatic residual (DGIR) image derived from the 2019 Australian National Gravity Grids B series. The grid is based on nearly 1.4 million ground stations and over 450,000 line kilometers of airborne gravity and gradiometry data, collected from the 1940s to 2019. It has a cell size of approximately 435 meters and data is provided in gravity units (um/s^2).

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Mineral and resource exploration targeting based on density variations in the crust.
• Integrating gravity data with other geophysical surveys for regional geological studies.
• Academic research into isostatic compensation and crustal thickness over Australia.

Strengths

• Integrates a large volume of observations, including nearly 1.4 million ground stations and over 450,000 line km of airborne data.
• Data quality is checked by GA geophysicists to ensure it is fit-for-purpose.
• Provides high-resolution coverage with a grid cell size of approximately 435 meters.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

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

Collection Method

Processed from ground observations, airborne gravity and gradiometry surveys, and global gravity grids.

Time Range

Data acquired from the 1940s to 2019, compiled as of September 2019.

Freshness

Last updated 2026-05-05 00:07:59.229950; freshness should be verified.

Geography

Australia and its continental margins.