Australian National Gravity Anomaly Grid with Airborne Data, 2019

Australia's 2019 National Gravity Compilation integrates approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and airborne surveys totalling 451,000 line kilometers. The grid, with a cell size of approximately 435 meters, combines data from government, industry, and academic sources collected from the 1940s onward, supplemented with offshore data from global institutions. It represents the tilt filter of complete Bouguer anomalies over the continent and its margins.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Enhance mineral exploration targeting by integrating airborne gravity gradiometry data.
• Refine continental-scale geophysical models using the combined ground and offshore gravity grid.

Strengths

• Integrates a large volume of observations, including approximately 1.8 million gravity stations.
• Combines multiple data sources: ground, airborne (345,000 line km gravity, 106,000 line km gradiometry), and global offshore grids.
• Data quality is checked by GA geophysicists to ensure it is fit-for-purpose.
• Provides improved resolution in areas where ground data was insufficient through airborne surveys.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-06-27 19:24:45.162470; freshness should be verified.

Provenance

Source

Australian National Gravity Database (ANGD), Global Gravity grid (Scripps, NOAA, NGA), and various government, industry, and academic surveys.

Collection Method

Ground and airborne gravity observations processed with standard methods and terrain corrections, compiled into a grid.

Time Range

1940s to 2019

Freshness

Last updated 2026-06-27 19:24:45.162470.

Geography

Australia and its continental margins