National Gravity Compilation 2019: Airborne DGIR Tilt Grid for Australia

Nearly 1.8 million gravity observations, including 1.4 million ground stations and 451,000 line km of airborne surveys, were used to create this 2019 grid. The dataset, compiled by Geoscience Australia, integrates ground, airborne, and offshore data to model subsurface geological structures. It provides a tilt-filtered view of de-trended global isostatic residual anomalies across Australia and its continental margins at a cell size of approximately 435 meters.

Use Cases

• Detect edges of geological units based on the tilt filter derived from gravity anomalies.
• Model subsurface density variations based on processed Complete Bouguer Anomaly data.
• Integrate ground and airborne gravity data to improve resolution in areas with sparse ground coverage.

Strengths

• Integrates a large volume of data, including nearly 1.4 million ground gravity stations and 451,000 line km of airborne surveys.
• Data quality is checked by GA geophysicists to ensure it is fit-for-purpose.
• Combines multiple data sources, including ground observations, offshore global gravity data, and airborne surveys for comprehensive coverage.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data may reflect geographic or source bias inherent to the compilation of data from government, industry, and research sources over many decades.

Provenance

Source

Geoscience Australia Data, incorporating data from Commonwealth, State, and Territory Governments, the mining industry, universities, and research organisations.

Collection Method

Processed from the 2019 Australian National Gravity Grids B series, applying a tilt filter via Fast Fourier Transform to a de-trended global isostatic residual grid.

Time Range

Data acquired from the 1940s to September 2019.

Freshness

Last updated 2026-04-20 03:29:11.412658; freshness should be verified.

Geography

Australia and its continental margins.