National Gravity Compilation 2019: Airborne CSCBA 0.5VD Grid for Australia

Australia's 2019 gravity anomaly grid, derived from nearly 1.8 million ground and airborne observations. The grid has a cell size of 0.00417 degrees (approximately 435m) and incorporates data from the 1940s to 2019, processed by Geoscience Australia. It shows a half vertical derivative of complete Bouguer anomalies over the continent and its margins.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly measurements.
• Mineral and resource exploration targeting based on density variations in the crust.
• Integrating gravity data with other geophysical surveys for enhanced geological interpretation.
• Studying continental-scale tectonic features using the processed spherical cap Bouguer anomaly grid.

Strengths

• Integrates approximately 1.8 million gravity observations from ground, airborne gravity (345,000 line km), and gradiometry (106,000 line km) sources.
• Data quality is checked by GA geophysicists, and terrain corrections were applied using offshore bathymetry and onshore topography.
• Station spacing varies from 11 km to less than 1 km, with airborne survey line spacing from 0.5 km to 2.5 km, suggesting detailed regional coverage.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific analytical methods.
• Freshness should be verified; the underlying gravity database snapshot is from September 2019.

Provenance

Source

Geoscience Australia (GA), Australian National Gravity Database, supplemented by global data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Data acquired by government, industry, and research organizations, processed via standard methods and a Fast Fourier Transform (FFT).

Time Range

1940s to 2019

Freshness

Last updated 2026-06-27 18:18:04.651895; underlying data snapshot from September 2019.

Geography

Australia and its continental margins