National Gravity Compilation 2019 DGIR Tilt Grid for Australia

The National Gravity Compilation 2019 DGIR tilt grid is a geophysical dataset produced by Geoscience Australia from the 2019 Australian National Gravity Grids A series. It contains nearly 1.4 million gravity stations from the Australian National Gravity Database and offshore data, processed to a grid with a cell size of approximately 435 meters. The grid shows a tilt of de-trended global isostatic residual anomalies, used for detecting edges of geological units.

Use Cases

• Detecting edges of geological units based on the tilt filter derived from gravity anomalies.
• Interpreting subsurface geological structure based on processed gravity data measuring rock density changes.
• Mapping continental margin features based on gravity data covering Australia and its offshore areas.

Strengths

• Derived from nearly 1.4 million gravity stations from a national database.
• Grid cell size is 0.00417 degrees (approximately 435 meters), providing a specific spatial resolution.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Incorporates ground observations collected from the 1940s to the present day.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

Geoscience Australia (GA), Australian Ocean Data Network

Collection Method

Ground and marine gravity observations processed via standard methods and a fast Fourier transform (FFT) to create a tilt grid.

Time Range

Ground data collected from the 1940s to present, with database snapshot as of September 2019.

Freshness

Last updated 2026-04-28 13:26:38.166538; freshness should be verified

Geography

Australia and its continental margins.