Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations, were used to generate this grid. The processed data is checked for quality by GA geophysicists and derived from the Australian National Gravity Database as of September 2019, supplemented by offshore data. The grid has a cell size of 0.00417 degrees (approximately 435m) and shows a tilt of de-trended global isostatic residual anomalies over Australia and its continental margins.
Use Cases
- Detect edges of geological units based on the tilt filter derived from DGIR anomalies.
- Interpret subsurface geological structure based on processed gravity data.
- Analyze continental-scale density variations based on the national gravity grid.
- Integrate ground and marine gravity data for regional geophysical studies.
Strengths
- Grid derived from approximately 1.8 million gravity observations, including nearly 1.4 million ground stations.
- Data quality checked by GA geophysicists to ensure fitness for purpose.
- Cell size of 0.00417 degrees (approximately 435m) provides a consistent resolution.
- Combines ground data from the 1940s onward with offshore data from global sources.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Station spacing for ground observations varies from 11 km to less than 1 km, leading to uneven coverage.
- Row count is unknown, which may limit suitability assessment.
Provenance
- Source
- Australian Ocean Data Network
- Collection Method
- Processed from ground observations in the Australian National Gravity Database and offshore data from Scripps Institution of Oceanography, NOAA, and NGA.
- Time Range
- Ground data collected from the 1940s to present, compiled as of September 2019.
- Freshness
- Last updated 2026-04-16 15:03:49.067544; freshness should be verified.
- Geography
- Australia and its continental margins.