National Gravity Compilation 2019: Complete Bouguer Anomaly Image of Australia

A gravity anomaly image derived from the 2019 Australian National Gravity Grids A series. The grid is based on nearly 1.4 million ground stations from the Australian National Gravity Database and supplemented by offshore data, with observations collected from the 1940s to 2019. The data, processed and quality-checked by Geoscience Australia, measures subsurface rock density variations in units of um/s^2 (gravity units) at a cell size of approximately 435 meters.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly measurements.
• Mineral and resource exploration targeting based on density contrasts in the crust.
• Integrating gravity data with other geophysical datasets for continental-scale studies.
• Calculating terrain corrections for gravity surveys using the described bathymetry and topography data.

Strengths

• Integrates nearly 1.4 million gravity stations from a national database.
• Combines ground data collected from the 1940s onward with offshore global gravity data.
• Data is processed with standard methods and quality-checked by GA geophysicists.
• Provides continent-wide coverage of Australia and its margins at a ~435m resolution.

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 and temporal bias inherent to the aggregation of decades of surveys.

Provenance

Source

Geoscience Australia Data, incorporating data from Commonwealth, State, Territory Governments, industry, universities, and global sources.

Collection Method

Ground and airborne gravity observations processed into a grid, supplemented by the Scripps/NOAA/NGA Global Gravity grid v28.1.

Time Range

Observations from the 1940s to September 2019.

Freshness

Last updated 2026-04-20 00:59:31.333357; freshness should be verified.

Geography

Australia and its continental margins.