National Gravity Compilation 2019 DGIR: De-Trended Gravity Anomaly Image of Australia

Australia and its continental margins are covered by this gravity anomaly image derived from nearly 1.4 million ground and marine observations. The grid has a cell size of approximately 435 meters and shows de-trended global isostatic residual anomalies. Data were compiled from the Australian National Gravity Database as of September 2019, supplemented by global marine data, with ground observations collected from the 1940s to the present day.

Use Cases

• Model subsurface geological structure based on gravity anomaly patterns.
• Train computer vision models for geophysical feature detection using the raster image.
• Integrate gravity data with other geospatial layers for mineral exploration.
• Analyze regional crustal density variations based on the de-trended isostatic residual values.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense spatial coverage.
• Integrates decades of data from the 1940s to present, sourced from government, industry, and academic surveys.
• Station spacing in major parts of the continent is between 2.5 and 7 kilometers.
• Quality-checked by GA geophysicists to ensure data are 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 specific ML tasks.

Provenance

Source

Australian Ocean Data Network, incorporating data from Commonwealth, State/Territory Governments, industry, universities, and global marine grids.

Collection Method

Ground and marine gravity observations processed into a grid, with isostatic and trend corrections applied.

Time Range

Ground data collected from the 1940s to present; compilation snapshot as of September 2019.

Freshness

Last updated 2026-04-04 07:23:31.853000; freshness should be verified.

Geography

Australia and its continental margins.