National Gravity Compilation 2019 (CSCBA): Australian Subsurface Density Grid

Nearly 1.4 million gravity stations from the Australian National Gravity Database were used to generate this spherical cap Bouguer anomaly grid. The grid has a cell size of 0.00417 degrees (approximately 435 meters) and is expressed in gravity units (um/s^2). This 2019 compilation, processed by GA geophysicists, integrates ground observations with offshore data from Scripps Institution of Oceanography, NOAA, and NGA.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Map density variations in the Earth's crust for mineral exploration.
• Integrate gravity data with other geophysical surveys for a composite subsurface interpretation.
• Calibrate satellite-derived gravity measurements with high-resolution ground-based observations.

Strengths

• Derived from nearly 1.4 million quality-checked gravity stations.
• Integrates Australian ground data with a major global offshore gravity grid (v28.1).
• Processed and checked for quality by GA geophysicists to be fit-for-purpose.
• Provides a standardized spherical cap Bouguer anomaly grid at a ~435m resolution.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Freshness should be verified; the underlying observations are from September 2019.
• Data may reflect geographic bias inherent to the distribution of gravity stations in Australia.

Provenance

Source

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

Collection Method

Ground gravity observations processed via standard methods and gridded.

Time Range

Observations as of September 2019.

Freshness

Last updated 2026 06 04 06:56:29.742364; the data compilation itself is from 2019.

Geography

Australia, supplemented with offshore data.