Australian Gravity Anomaly Grid with 435m Resolution

A gravity anomaly grid derived from approximately 1.8 million ground and marine gravity observations across Australia and its continental margins. The data, processed by Geoscience Australia, includes observations from the 1940s to 2019, with station spacing ranging from 11 km to less than 1 km. The final image grid has a cell size of 0.00417 degrees (approximately 435m) and shows complete Bouguer anomalies.

Use Cases

• Model subsurface geological structures based on gravity anomaly measurements.
• Analyze continental crust density variations based on Bouguer anomaly data.
• Integrate gravity data with other geophysical surveys based on the detailed station spacing.
• Map terrain corrections for gravity surveys based on combined offshore bathymetry and onshore topography.

Strengths

• Derived from nearly 1.4 million gravity stations in the Australian National Gravity Database.
• Grid cell size of approximately 435m provides detailed spatial resolution.
• Data quality checked by Geoscience Australia geophysicists to ensure fitness for purpose.
• Incorporates marine data from a global gravity grid sourced from Scripps Institution of Oceanography, NOAA, and NGA.

Limitations

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

Provenance

Source

Geoscience Australia (GA), supplemented by data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Ground and marine gravity observations processed via standard methods and compiled into a grid.

Time Range

Observations from the 1940s to September 2019.

Freshness

Last updated 2026-04-16 16:22:44.272629; freshness should be verified.

Geography

Australia and its continental margins.