Australian Gravity Anomaly Grid With Tilt Filter

Nearly 1.4 million gravity stations from a national database were used to generate this continental-scale grid. The Australian Ocean Data Network compiled ground and offshore data acquired from the 1940s onward, releasing this processed tilt grid in 2019. It provides a detailed geophysical model of Australia and its continental margins with a spatial resolution of approximately 435 meters.

Use Cases

• Map geological structures by interpreting the tilt-filtered gravity anomaly values across the 0.00417-degree cell grid.
• Model crustal thickness and density contrasts using the spherical cap Bouguer anomaly data derived from ground and offshore observations.
• Integrate terrain-corrected gravity data with other geospatial layers for regional resource assessment.
• Analyze spatial patterns in gravity station density, which varies from less than 1 km to 11 km across the continent.

Strengths

• Derived from nearly 1.4 million quality-checked gravity stations from a national database.
• Continental coverage of Australia and its margins with a consistent cell size of 0.00417 degrees (~435m).
• Incorporates decades of data from government, industry, and academic sources collected from the 1940s to 2019.
• Data processed with terrain corrections using offshore bathymetry and onshore topography.

Limitations

• Specific row count and file size for the grid are not provided.
• The underlying gravity station data has uneven spatial density, ranging from under 1 km to 11 km spacing.
• The core gravity observations are current only through September 2019.

Provenance

Source

Australian National Gravity Database (ANGD) and v28.1 of the Global Gravity grid 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 the spherical cap Bouguer anomaly.

Time Range

1940s to September 2019.

Freshness

The grid is derived from data as of September 2019, though the metadata was updated in April 2026.

Geography

Australia and its continental margins.