A processed gravity anomaly grid for Australia and its continental margins, derived from approximately 1.8 million ground, airborne, and offshore observations. The grid has a cell size of 0.00417 degrees (approximately 435m) and includes a first vertical derivative calculation. Data was compiled by Geoscience Australia and sourced from government, industry, and research surveys from the 1940s to 2019.
Use Cases
- Model subsurface geological structure based on gravity anomaly patterns.
- Interpret density variations in the Earth's crust using the first vertical derivative grid.
- Integrate gravity data with other geophysical datasets for regional geological studies.
- Assess the quality of ground gravity data by comparing it with airborne gravity and gradiometry surveys.
Strengths
- Integrates approximately 1.8 million gravity observations from multiple sources.
- Includes 345,000 line km of airborne gravity and 106,000 line km of airborne gravity gradiometry data for improved resolution.
- Processed and quality-checked by GA geophysicists to ensure fitness for purpose.
- Terrain corrections were calculated using both offshore bathymetry and onshore topography data.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment.
- Last updated 2026-05-05 04:15:31.723173; freshness should be verified.
Provenance
- Source
- Australian National Gravity Database (ANGD), Global Gravity grid (Scripps Institution of Oceanography, NOAA, NGA), and various government, industry, and university surveys.
- Collection Method
- Ground, airborne, and offshore gravity observations processed via standard methods and a Fast Fourier Transform (FFT).
- Time Range
- 1940s to 2019.
- Freshness
- Data compilation is from 2019, with metadata updated in 2026.
- Geography
- Australia and its continental margins.