National Gravity Compilation 2019: Airborne DGIR Image of Australia

2019 Australian gravity anomaly grid derived from approximately 1.8 million observations, including ground stations and airborne surveys totaling 451,000 line kilometers. The compilation, produced by Geoscience Australia, integrates data from government, industry, and research sources dating from the 1940s to 2019. It presents de-trended global isostatic residual anomalies over Australia and its continental margins at a cell size of approximately 435 meters.

Use Cases

• Model subsurface geological structures based on gravity anomaly patterns.
• Identify regions for mineral exploration based on density contrasts in the crust.
• Integrate gravity data with other geophysical datasets for enhanced geological interpretation.
• Study continental-scale tectonic features based on isostatic residual anomalies.

Strengths

• Integrates nearly 1.4 million ground stations with 451,000 line km of airborne gravity and gradiometry data.
• Data quality is checked by GA geophysicists to ensure it is fit-for-purpose.
• Grid has a fine spatial resolution of approximately 435 meters (0.00417 degrees).
• Combines decades of data from multiple sources, including Commonwealth, State, and industry surveys.

Limitations

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

Provenance

Source

Geoscience Australia (GA), via the Australian Ocean Data Network.

Collection Method

Processed from the 2019 Australian National Gravity Grids B series, derived from the Australian National Gravity Database and global gravity grids.

Time Range

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

Freshness

Last updated 2026-04-10 22:14:26.997043; freshness should be verified.

Geography

Australia and its continental margins.