National Gravity Compilation 2019: Australian Subsurface Gravity Anomaly Grid

National Gravity Compilation 2019 (CSCBA) is a complete spherical cap Bouguer anomaly grid for Australia. It is derived from nearly 1.4 million ground gravity stations in the Australian National Gravity Database as of September 2019, supplemented with offshore data. The processed data, checked for quality by Geoscience Australia geophysicists, has a cell size of approximately 435 meters and is provided in gravity units (um/s^2).

Use Cases

• Modeling subsurface density variations based on the Bouguer gravity anomaly grid.
• Revealing geological structures for mineral exploration based on gravity data interpretation.
• Integrating offshore and onshore gravity data for continental-scale geophysical studies.
• Calibrating regional gravity models using the approximately 1.4 million quality-checked ground stations.

Strengths

• Derived from nearly 1.4 million quality-checked ground gravity stations from the national database.
• Integrates offshore data from a major global gravity grid (v28.1 from Scripps/NOAA/NGA).
• Data processing follows standard methods and is checked by GA geophysicists for fitness-for-purpose.
• Provides a high-resolution grid with a cell size of approximately 435 meters.

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 source bias inherent to the specific gravity surveys compiled.

Provenance

Source

Geoscience Australia (GA), Australian National Gravity Database, and Scripps Institution of Oceanography/NOAA/NGA global grid.

Collection Method

Ground gravity observations processed via standard methods and gridded, supplemented with offshore satellite-derived data.

Time Range

Data compiled as of September 2019.

Freshness

Last updated 2026-04-16 08:28:46.963505; freshness should be verified.

Geography

Australia and surrounding offshore regions.