Nearly 1.4 million ground gravity stations and over 451,000 line kilometers of airborne surveys were used to create this national gravity grid. The compilation integrates ground, airborne, and offshore data from the 1940s to 2019 to reveal subsurface geological structures across Australia and its continental margins. Geoscience Australia processed the data, applying a tilt filter to the de-trended global isostatic residual anomalies for edge detection.
Use Cases
- Mapping geological boundaries based on the tilt-filtered DGIR anomalies described
- Modeling subsurface density variations based on gravity anomaly data
- Integrating gravity data with other geophysical surveys for mineral exploration
- Studying continental-scale isostatic compensation based on the global isostatic residual corrections
Strengths
- Integrates approximately 1.8 million gravity observations from multiple sources
- Combines ground data with 345,000 line km of airborne gravity and 106,000 line km of airborne gravity gradiometry
- Data quality was checked by GA geophysicists to ensure fitness-for-purpose
- Grid cell size of 0.00417 degrees (approximately 435m) provides regional detail
Limitations
- Column-level documentation is absent; field semantics must be inferred after download
- Data may reflect geographic or source bias inherent to the compilation of historical surveys
Provenance
- Source
- Australian Ocean Data Network, Geoscience Australia, Commonwealth, State and Territory Governments, mining industry, universities
- Collection Method
- Processed from ground observations in the Australian National Gravity Database, offshore global gravity grids, and airborne surveys
- Time Range
- 1940s to 2019
- Freshness
- Last updated 2026-05-05 03:06:34.650456; freshness should be verified
- Geography
- Australia and its continental margins