A 2019 compilation integrates approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and 451,000 line km of airborne surveys. The Australian National Gravity Database, supplemented with global offshore data, was processed to produce a complete spherical cap Bouguer anomaly grid with a 435m cell size. The grid, derived from data collected from the 1940s onward and quality-checked by GA geophysicists, shows anomalies over Australia and its continental margins.
Use Cases
- Map subsurface geological structures based on gravity anomaly patterns.
- Enhance resolution in areas with sparse ground data using integrated airborne gravity and gradiometry surveys.
- Calculate terrain corrections for gravity models using integrated offshore bathymetry and onshore topography data.
- Apply FFT-based derivative processing to highlight near-surface density contrasts from the Bouguer anomaly grid.
Strengths
- Integrates approximately 1.8 million gravity observations from multiple sources.
- Includes 451,000 line km of airborne gravity and gravity gradiometry data to improve resolution.
- Grid has a spatial resolution of 0.00417 degrees (approximately 435m).
- Data underwent quality checks by GA geophysicists to ensure fitness for purpose.
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 bias inherent to data_gov_au, with variable station spacing from <1 km to 11 km.
Provenance
- Source
- Australian National Gravity Database (ANGD), Scripps Institution of Oceanography, NOAA, NGA, and various government and industry surveys.
- Collection Method
- Ground, airborne, and offshore gravity measurements processed via standard methods and FFT transformation.
- Time Range
- 1940s to 2019
- Freshness
- Last updated 2026-06-04 07:10:16.468755; freshness should be verified.
- Geography
- Australia and its continental margins