Australia and its continental margins are covered by a free air gravity anomaly grid compiled in 2019. The grid integrates approximately 1.4 million ground stations from the Australian National Gravity Database, 345,000 line km of airborne gravity data, and 106,000 line km of airborne gravity gradiometry, with data collected from the 1940s onward. It was processed and quality-checked by Geoscience Australia (GA) geophysicists and has a cell size of approximately 435 meters.
Use Cases
- Map subsurface geological structures based on gravity anomaly patterns.
- Identify density variations in the Earth's crust for mineral exploration.
- Integrate gravity data with other geophysical datasets for regional geological modeling.
- Improve resolution in areas with sparse ground data using included airborne surveys.
Strengths
- Integrates nearly 1.4 million ground gravity stations and over 451,000 line km of airborne data.
- Data collection spans from the 1940s to 2019, providing a long-term historical record.
- Grid has a fine cell size of approximately 435 meters (0.00417 degrees).
- Quality-checked 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 or source bias inherent to the compilation from multiple government, industry, and academic sources over decades.
Provenance
- Source
- Australian Ocean Data Network, Geoscience Australia, Scripps Institution of Oceanography, NOAA, NGA.
- Collection Method
- Processed from ground observations in the Australian National Gravity Database (ANGD), supplemented with offshore global gravity data and airborne surveys.
- Time Range
- 1940s to 2019 (compilation date).
- Freshness
- Last updated 2026-04-16 14:52:59.111433; freshness should be verified.
- Geography
- Australia and its continental margins.