National Gravity Compilation 2019: Tilt Grid of Australia at 435m Resolution

Australia and its continental margins are covered by this gravity anomaly grid derived from nearly 1.4 million ground and offshore gravity stations. The grid has a cell size of approximately 435 meters and was generated by Geoscience Australia using data from the 1940s to September 2019. Terrain corrections were applied using bathymetry and topography data, and a tilt filter was used to process the spherical cap Bouguer anomaly.

Use Cases

• Modeling subsurface density variations based on the processed gravity anomaly data.
• Mapping geological structures for mineral and hydrocarbon exploration using the tilt-filtered grid.
• Integrating gravity data with other geophysical surveys for regional geological studies.
• Assessing terrain corrections in gravity data interpretation using the described bathymetry and topography inputs.

Strengths

• Derived from nearly 1.4 million gravity stations, sourced from a national database containing approximately 1.8 million observations.
• Grid cell size is 0.00417 degrees (approximately 435m), providing a detailed spatial resolution.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Incorporates data from multiple sources including Commonwealth, State, and Territory governments, industry, and universities, collected from the 1940s onward.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Station spacing varies from 11 km to less than 1 km, which may create inconsistencies in data density across the continent.

Provenance

Source

Geoscience Australia Data, supplemented with offshore data from Scripps Institution of Oceanography, NOAA, and 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.

Time Range

1940s to September 2019

Freshness

Last updated 2026-04-20 03:13:14.305694; freshness should be verified.

Geography

Australia and its continental margins