Australian Bouguer Gravity Anomaly Grid from 2019 National Compilation

National Gravity Compilation 2019 CSCBA image is a gravity anomaly grid derived from nearly 1.4 million ground stations in the Australian National Gravity Database and offshore data. The grid has a cell size of 0.00417 degrees (approximately 435m) and presents data in units of micro-meters per second squared. It was compiled by Geoscience Australia using data acquired from the 1940s to September 2019 from government, industry, and academic sources.

Use Cases

• Model subsurface rock density distribution using the complete Bouguer anomaly values.
• Interpret geological structure for mineral exploration by analyzing spatial gravity anomaly patterns.
• Integrate gravity data with other geophysical datasets using the 435m grid cell size for correlation studies.
• Assess terrain corrections applied to the gravity data using the referenced offshore bathymetry and onshore topography.

Strengths

• Derived from nearly 1.4 million gravity station observations.
• Integrates ground data from the 1940s to 2019 with offshore global gravity data.
• Grid cell size of 0.00417 degrees provides a consistent spatial resolution.

Limitations

• Station spacing is uneven, varying from 11 km to less than 1 km across the continent.
• The underlying data compilation is static as of September 2019.
• Specific data formats (NetCDF) may require specialized libraries for access and analysis.

Provenance

Source

Australian National Gravity Database and v28.1 Global Gravity grid from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Ground and airborne gravity surveys processed via standard methods and quality-checked by GA geophysicists.

Time Range

1940s to September 2019.

Freshness

The compilation is based on data current to September 2019, though the record was updated in the catalog in April 2026.

Geography

Australia and its continental margins.