National Gravity Compilation 2019 Tilt Grid for Australia

Geoscience Australia's National Gravity Compilation 2019 tilt grid measures subsurface rock density variations across Australia and its continental margins. The grid is derived from nearly 1.4 million ground gravity stations from the Australian National Gravity Database, supplemented with offshore data, and has a cell size of approximately 435 meters. Data collection spans from the 1940s to September 2019, with station spacing ranging from less than 1 km to 11 km.

Use Cases

• Map subsurface geological structures based on gravity anomaly data.
• Model density variations in the Earth's crust for mineral exploration.
• Integrate gravity data with other geophysical datasets for regional geological studies.
• Assess terrain corrections applied to gravity measurements.

Strengths

• Derived from nearly 1.4 million gravity stations from a national database.
• Incorporates offshore data from Scripps Institution of Oceanography, NOAA, and NGA.
• Grid cell size is specified as 0.00417 degrees (approximately 435m).
• Data quality was checked by GA geophysicists before release.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic or temporal bias inherent to the source collection methods.

Provenance

Source

Geoscience Australia Data, Commonwealth, State and Territory Governments, mining industry, universities, and research organisations.

Collection Method

Ground gravity observations processed with terrain corrections and a tilt filter applied to a spherical cap Bouguer anomaly.

Time Range

1940s to September 2019.

Freshness

Last updated 2026-05-14 03:34:30.798594; freshness should be verified.

Geography

Australia and its continental margins.