National Gravity Compilation 2019 DGIR Grid: De-trended Isostatic Residual Anomalies

Australia and its continental margins are covered by this gravity grid with a cell size of approximately 435 meters. The grid is derived from nearly 1.4 million gravity stations in the Australian National Gravity Database as of September 2019, supplemented by offshore data. Geoscience Australia produced this de-trended global isostatic residual anomaly grid from ground observations collected from the 1940s onward.

Use Cases

• Modeling subsurface geological structures based on de-trended global isostatic residual anomalies.
• Mineral and resource exploration targeting based on density variations in the Earth's crust.
• Regional tectonic studies based on gravity anomaly patterns over Australia and its margins.
• Integrating ground and marine gravity data for continental-scale geophysical analysis.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense spatial coverage.
• Station spacing for ground observations varies from 11 km down to less than 1 km, with major parts of the continent between 2.5 and 7 km.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Integrates decades of data from government, industry, and research sources collected from the 1940s onward.

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

Collection Method

Processed from ground observations in the Australian National Gravity Database and offshore data from the Scripps Institution of Oceanography, NOAA, and NGA.

Time Range

Ground observations from the 1940s to September 2019.

Freshness

Last updated 2026-03-25 18:09:19.820719; freshness should be verified.

Geography

Australia and its continental margins.