National Gravity Compilation 2019 Tilt Image of Australia

Geoscience Australia's National Gravity Compilation 2019 tilt image is a gravity anomaly grid covering Australia and its continental margins. It integrates nearly 1.4 million ground gravity stations from the Australian National Gravity Database and offshore data from Scripps Institution of Oceanography, NOAA, and NGA. The grid has a cell size of approximately 435 meters and uses data collected from the 1940s to September 2019.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Identify potential mineral and hydrocarbon resources based on density contrasts in the Earth's crust.
• Integrate gravity data with other geophysical datasets for regional geological studies.
• Perform terrain corrections for gravity surveys based on the described use of bathymetry and topography data.

Strengths

• Integrates nearly 1.4 million gravity stations from a national database.
• Grid cell size is 0.00417 degrees (approximately 435m), providing a specific spatial resolution.
• Data quality was checked by GA geophysicists, as stated in the description.
• Combines ground data collected from the 1940s onward with modern offshore global gravity data.

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

Collection Method

Ground and offshore gravity observations processed with standard methods, terrain corrections, and a tilt filter applied to a spherical cap Bouguer anomaly grid.

Time Range

1940s to September 2019.

Freshness

Last updated 2026-05-14 03:32:13.757098; freshness should be verified.

Geography

Australia and its continental margins.