National Gravity Compilation 2019 Tilt Grid for Australia at 435m Resolution

A gravity anomaly grid derived from approximately 1.4 million ground and offshore gravity stations. The grid has a cell size of 0.00417 degrees (approximately 435m) and covers Australia and its continental margins. Data was compiled by Geoscience Australia from observations dating from the 1940s to September 2019, processed with terrain corrections and a tilt filter.

Use Cases

• Modeling subsurface density variations based on processed gravity anomaly data.
• Mapping geological structures for mineral exploration based on the tilt-filtered gravity grid.
• Integrating gravity data with other geophysical surveys for continental-scale studies.
• Analyzing terrain-corrected gravity anomalies to infer bedrock topography.

Strengths

• Derived from nearly 1.4 million gravity stations from a source database of approximately 1.8 million observations.
• Grid cell size is specified as 0.00417 degrees (approximately 435m).
• Incorporates data from multiple sources including Commonwealth, State, and industry surveys spanning from the 1940s to 2019.
• Processing includes terrain corrections using offshore bathymetry and onshore topography.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Station spacing varies from 11 km to less than 1 km, which may create uneven resolution.
• Freshness should be verified; the underlying gravity database is current only to September 2019.

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 terrain corrections and a tilt filter applied to a spherical cap Bouguer anomaly.

Time Range

1940s to September 2019

Freshness

Last updated 2026-04-30 13:17:20.120137; underlying data current to September 2019.

Geography

Australia and its continental margins