National Gravity Compilation 2019: Airborne DGIR 0.5VD Image of Australia

Australia's 2019 National Gravity Compilation includes a half vertical derivative image of de-trended global isostatic residual (DGIR) anomalies. The grid is derived from approximately 1.8 million observations, including nearly 1.4 million ground stations and over 450,000 line kilometers of airborne gravity and gradiometry data collected from the 1940s onward. The final image has a cell size of approximately 435 meters and covers Australia and its continental margins.

Use Cases

• Map subsurface geological structures based on gravity anomaly data.
• Identify potential mineral exploration targets based on density variations in the crust.
• Integrate gravity data with other geophysical surveys for enhanced geological modeling.
• Study continental-scale isostatic compensation and crustal thickness.

Strengths

• Integrates a large volume of data, including approximately 1.8 million gravity observations.
• Combines ground, airborne gravity, and airborne gravity gradiometry data for improved resolution.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Provides continent-wide coverage of Australia and its margins.

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 and temporal bias inherent to the compilation of historical surveys.

Provenance

Source

Australian Ocean Data Network, incorporating data from Commonwealth, State, Territory Governments, industry, and universities.

Collection Method

Processed from the 2019 Australian National Gravity Grids B series, applying a half vertical derivative via FFT to a DGIR grid.

Time Range

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

Freshness

Last updated 2026-05-04 23:27:31.773699; freshness should be verified.

Geography

Australia and its continental margins.