Gravity data measuring changes in rock density beneath Earth's surface, processed to isolate geological signals. The image is derived from approximately 1.8 million gravity observations, including nearly 1.4 million ground stations from the Australian National Gravity Database and supplemented marine data. It was produced by Geoscience Australia from data collected by government, industry, and research organizations from the 1940s onward.
Use Cases
- Model subsurface geological structures based on de-trended global isostatic residual anomalies.
- Assist mineral exploration by interpreting density variations in the Earth's crust.
- Integrate gravity data with other geophysical datasets for comprehensive geological mapping.
- Study continental margin geology using gravity anomalies over Australia and its margins.
Strengths
- Derived from approximately 1.8 million gravity observations, including nearly 1.4 million ground stations.
- Data quality is checked by GA geophysicists to ensure fitness for purpose.
- Grid has a cell size of 0.00417 degrees (approximately 435m), providing detailed spatial resolution.
- Incorporates data from multiple sources, including government, industry, and universities, spanning from the 1940s to present.
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 temporal bias inherent to the collection methods and sources.
Provenance
- Source
- Australian Ocean Data Network, Geoscience Australia (GA)
- Collection Method
- Processed from ground observations in the Australian National Gravity Database (ANGD) as of September 2019 and offshore data from the Global Gravity grid.
- Time Range
- Data collected from the 1940s to present day.
- Freshness
- Last updated 2026-04-16 15:59:52.077707; freshness should be verified.
- Geography
- Australia and its continental margins.