National Gravity Compilation 2019: Tilt-Filtered Gravity Anomaly Grid

Geoscience Australia's National Gravity Compilation 2019 tilt image is a processed gravity anomaly grid derived from the 2019 Australian National Gravity Grids A series. It synthesizes nearly 1.4 million ground-based gravity stations from the Australian National Gravity Database and offshore data from the Scripps Institution of Oceanography. The grid has a cell size of approximately 435 meters and covers Australia and its continental margin.

Use Cases

• Mapping subsurface geological structures based on gravity anomaly patterns.
• Supporting mineral and resource exploration by revealing density contrasts in the crust.
• Integrating with other geophysical datasets for regional geological modeling.
• Calculating terrain corrections for gravity data using bathymetry and topography.

Strengths

• Derived from a substantial observational base of nearly 1.4 million gravity stations.
• Incorporates data from multiple authoritative sources, including government, industry, and academic collections from the 1940s onward.
• Processed with standard methods and quality-checked by GA geophysicists for fitness-for-purpose.

Limitations

• Specific column names, row counts, and license information are not provided in the available metadata.
• The 'last updated' dates (2026-06-17, 2026-04-10) appear to be future dates, indicating potential metadata errors or placeholder values.

Provenance

Source

Geoscience Australia (GA), Australian National Gravity Database (ANGD), Scripps Institution of Oceanography (Global Gravity grid v28.1).

Collection Method

Ground and marine gravity observations processed into a spherical cap Bouguer anomaly grid, with a tilt filter applied.

Time Range

1940s to September 2019.

Freshness

2026-06-17 01:06:48.670192

Geography

Australia and its continental margin.