National Gravity Compilation 2019: Airborne DGIR Tilt Image of Australia

Australia and its continental margins are covered by a gravity anomaly grid with a cell size of approximately 435 meters. The compilation integrates nearly 1.4 million ground stations and over 450,000 line kilometers of airborne gravity and gradiometry data, collected from the 1940s to 2019. Geoscience Australia produced this 2019 grid, which applies a tilt filter to de-trended global isostatic residual anomalies to highlight geological edges.

Use Cases

• Detecting edges of geological units based on the applied tilt filter described in the processing steps.
• Modeling subsurface density variations for mineral exploration based on the gravity anomaly measurements.
• Integrating regional geological interpretations using the combined ground and airborne gravity data sources.
• Calibrating or validating other geophysical surveys using the standardized, quality-checked gravity grid.

Strengths

• Integrates approximately 1.8 million observations from multiple sources, including ground, airborne gravity, and airborne gravity gradiometry.
• Data has undergone standard processing and quality checks by GA geophysicists to be fit-for-purpose.
• Provides continental-scale coverage of Australia with ground station spacing as dense as less than 1 km in parts.

Limitations

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

Provenance

Source

Geoscience Australia Data, incorporating data from Commonwealth, State, Territory Governments, industry, universities, and global grids.

Collection Method

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

Time Range

Data acquired from the 1940s to September 2019.

Freshness

Last updated 2026-04-20 01:34:32.610515; freshness should be verified.

Geography

Australia and its continental margins.