National Gravity Compilation 2019: Airborne DGIR Tilt Grid for Australia

Nearly 1.8 million gravity observations underpin this 2019 national compilation, integrating ground stations, 345,000 line km of airborne gravity, and 106,000 line km of airborne gravity gradiometry data. The grid, with a 435-meter cell size, shows a tilt of de-trended global isostatic residual anomalies to highlight geological edges. Data from Commonwealth, State, industry, and academic sources collected from the 1940s onward were processed by Geoscience Australia.

Use Cases

• Map subsurface density variations based on processed gravity anomaly data.
• Identify edges of geological units based on the applied tilt filter.
• Augment regional geological models with high-resolution airborne gravity and gradiometry data.
• Integrate offshore and onshore gravity data for continental margin studies.

Strengths

• Integrates approximately 1.8 million gravity observations from multiple sources.
• Includes 345,000 line km of airborne gravity and 106,000 line km of airborne gravity gradiometry for enhanced resolution.
• Ground station spacing varies from 11 km down to less than 1 km, with major parts between 2.5 and 7 km.
• 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.
• Data may reflect geographic bias inherent to data_gov_au, with variable station density across Australia.

Provenance

Source

Australian National Gravity Database (ANGD), Global Gravity grid v28.1, and various government, industry, and academic surveys.

Collection Method

Ground and airborne observations processed via standard methods, with a tilt filter applied via fast Fourier transform to a de-trended global isostatic residual grid.

Time Range

1940s to 2019

Freshness

Last updated 2026-06-04 07:34:34.135091; freshness should be verified.

Geography

Australia and its continental margins