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

Data from the 1940s to 2019, compiled as of September 2019, forms this gravity anomaly image. It is derived from nearly 1.4 million ground stations from the Australian National Gravity Database and offshore data, processed by Geoscience Australia. The grid has a cell size of approximately 435 meters and shows de-trended global isostatic residual anomalies over Australia and its continental margins.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Aiding mineral and resource exploration by interpreting density variations in the crust.
• Integrating with other geophysical datasets for regional geological studies based on the continental coverage.

Strengths

• Derived from nearly 1.4 million gravity observation stations, providing dense spatial coverage.
• Ground station spacing 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.
• Incorporates offshore data from a global gravity grid developed by Scripps Institution of Oceanography, NOAA, and NGA.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• The temporal coverage is broad (1940s-present) but the compilation date is 2019; freshness should be verified for recent applications.

Provenance

Source

Geoscience Australia (GA), Australian National Gravity Database, supplemented by global data from Scripps Institution of Oceanography/NOAA/NGA.

Collection Method

Ground and marine gravity observations processed into a grid, with specific corrections applied to create the de-trended global isostatic residual image.

Time Range

1940s to 2019 (compilation date September 2019).

Freshness

Last updated 2026-06-23 03:30:53.294953; compilation based on data as of September 2019.

Geography

Australia and its continental margins.