Over 1.8 million gravity observations from the Australian National Gravity Database, supplemented by airborne and global satellite data, were used to produce these grids. Geoscience Australia and GNS Science combined ground, airborne, and offshore data to create Free Air Anomaly, Complete Bouguer Anomaly, and De-trended Global Isostatic Residual grids at a 400-metre cell size. The grids provide a continent-wide view of gravity anomalies, updated in 2020 to correct artefacts in the DGIR grids.
Use Cases
- Model subsurface density variations and geological structures based on Bouguer anomaly values.
- Interpret regional tectonic features and crustal thickness based on de-trended global isostatic residual values.
- Integrate gravity data with other geophysical datasets for mineral exploration based on the high-resolution 400m grid.
- Study the transition between continental and oceanic crust based on the combined onshore and offshore gravity data.
Strengths
- Grid resolution improved to 400 metres from previous 800-metre versions.
- Incorporates over 1.4 million suitable observations from a database of 1.8 million.
- Combines ground, airborne (345,000 line km), and global satellite-derived gravity data for continent-wide coverage.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Data may reflect geographic and temporal bias inherent to the aggregation of surveys from the 1940s to present.
Provenance
- Source
- Geoscience Australia and GNS Science.
- Collection Method
- Grids calculated from the Australian National Gravity Database, airborne surveys, and the NOAA Global Gravity Grid.
- Time Range
- Data acquired from the 1940s to September 2019.
- Freshness
- Last updated 2026-05-05 04:47:42.378672; freshness should be verified.
- Geography
- Australia, including onshore and offshore regions.