National Gravity Compilation 2019 DGIR Tilt Grid for Australia

Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations, were used to generate this grid. The data were compiled by Geoscience Australia from Commonwealth, State, Territory, industry, and academic sources, with measurements dating from the 1940s to 2019. This grid shows a tilt of the de-trended global isostatic residual anomalies over Australia and its continental margins at a cell size of approximately 435 meters.

Use Cases

• Detecting edges of geological units based on the tilt filter derived from the DGIR grid.
• Mapping subsurface density variations based on processed gravity anomaly data.
• Revealing continental-scale geological structure based on the national gravity compilation.
• Integrating ground and marine gravity data for regional geophysical models.

Strengths

• Incorporates nearly 1.4 million ground gravity stations from the Australian National Gravity Database.
• Combines ground data with offshore data from a global gravity grid sourced from Scripps, NOAA, and NGA.
• Data quality was checked by GA geophysicists to ensure fitness-for-purpose.
• 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.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-05-14 03:10:53.311815; freshness should be verified.

Provenance

Source

Geoscience Australia Data, Commonwealth/State/Territory Governments, mining/exploration industry, universities, research organisations, Scripps Institution of Oceanography, NOAA, NGA.

Collection Method

Ground and marine gravity observations processed via standard methods, with a tilt filter applied via FFT to the DGIR grid.

Time Range

1940s to September 2019.

Freshness

Last updated 2026-05-14 03:10:53.311815

Geography

Australia and its continental margins.