National Gravity Compilation 2019 DGIR Image: De-Trended Gravity Anomalies Over Australia

Australia and its continental margins are covered by this gravity anomaly image derived from nearly 1.4 million ground and marine stations. The grid has a cell size of approximately 435 meters and presents de-trended global isostatic residual anomalies in gravity units (um/s^2). Data were compiled by Geoscience Australia from government, industry, and academic sources dating from the 1940s to 2019.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Interpret crustal density variations for mineral exploration targeting.
• Integrate gravity data with other geophysical datasets for regional geological mapping.
• Calibrate or validate geophysical models using nationally consistent gravity grids.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense continental coverage.
• Station spacing varies from 11 km to less than 1 km, with major parts between 2.5 and 7 km.
• Incorporates data from multiple sources (Commonwealth, State, industry, universities) spanning from the 1940s to 2019.
• Processed and quality-checked by Geoscience Australia geophysicists to be fit-for-purpose.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for large-scale ML tasks.
• Last updated 2026-05-14 03:25:15.434824; freshness should be verified against more recent compilations.

Provenance

Source

Geoscience Australia Data

Collection Method

Grid generated from ground observations in the Australian National Gravity Database and offshore data from the Scripps Institution of Oceanography/NOAA/NGA global grid.

Time Range

1940s to 2019

Freshness

Data current as of September 2019; metadata last updated 2026-05-14.

Geography

Australia and its continental margins