The 2019 compilation integrates gravity data from the 1940s to present day. It combines approximately 1.8 million observations, including 1.4 million ground stations and 451,000 line kilometers of airborne surveys, to produce a grid of de-trended global isostatic residual anomalies. The grid was processed by Geoscience Australia and derived from the Australian National Gravity Database and global sources.
Use Cases
- Model subsurface geological structures based on density variations revealed by gravity anomalies.
- Identify mineral exploration targets based on enhanced resolution from airborne gravity and gradiometry data.
- Analyze continental crustal structure based on the de-trended global isostatic residual (DGIR) anomalies.
- Integrate gravity data with other geophysical datasets for regional geological mapping.
Strengths
- Integrates nearly 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 for improved resolution.
- Data quality was checked by GA geophysicists to ensure fitness for purpose.
- Grid cell size is 0.00417 degrees (approximately 435m), providing a detailed spatial representation.
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 bias inherent to data_gov_au, with variable station spacing from 11 km to less than 1 km.
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 and offshore data from Scripps Institution of Oceanography, NOAA, and NGA.
- Time Range
- 1940s to present day (as of September 2019 compilation).
- Freshness
- Last updated 2026-04-16 14:55:17.090570; freshness should be verified.
- Geography
- Australia and its continental margins.