National Gravity Compilation 2019: Free Air Anomaly Grid for Australia

Nearly 1.4 million gravity stations from the Australian National Gravity Database were used to generate this free air anomaly grid. The grid covers Australia and its continental margins with a cell size of approximately 435 meters, showing anomalies in units of um/s^2. Geoscience Australia compiled this data from ground observations dating from the 1940s onward, supplemented with offshore data from global sources.

Use Cases

• Model subsurface geological structures based on gravity anomaly patterns.
• Identify potential mineral or hydrocarbon resources based on density variations in the crust.
• Integrate gravity data with other geophysical surveys for regional geological interpretation.
• Train machine learning models for geospatial prediction of rock density.

Strengths

• Derived from nearly 1.4 million gravity stations out of approximately 1.8 million total observations.
• Station spacing is detailed, ranging from 11 km down to less than 1 km, with major parts of the continent between 2.5 and 7 km.
• Data compilation includes observations from the 1940s to the present, sourced from government, industry, and academic institutions.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific computational tasks.

Provenance

Source

Geoscience Australia Data, supplemented with offshore data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Ground gravity observations processed via standard methods and checked by GA geophysicists, gridded with offshore data.

Time Range

Ground observations from the 1940s to present, compiled as of September 2019.

Freshness

Last updated 2026-04-30 14:14:37.163487; freshness should be verified.

Geography

Australia and its continental margins.