National Gravity Compilation 2019 Tilt Grid for Australia

Australia and its continental margins are covered by this gravity anomaly grid derived from nearly 1.4 million ground and offshore gravity observations. The grid has a cell size of approximately 435 meters and integrates data from the 1940s to September 2019, processed with terrain corrections and a tilt filter. Geoscience Australia and partner organizations produced this dataset to reveal sub-surface geological structure.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Mapping continental margin geology based on integrated onshore and offshore gravity data.
• Supporting mineral and resource exploration based on density variations in the Earth's crust.
• Correcting terrain effects in geophysical surveys based on applied 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 regional detail.
• Data quality is checked by GA geophysicists to be fit-for-purpose.
• Combines decades of data from government, industry, and research sources from the 1940s onward.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Station spacing varies from 11 km to less than 1 km, indicating uneven data density across the continent.

Provenance

Source

Australian National Gravity Database (ANGD) and Global Gravity grid 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 2026-04-16 09:03:26.758204; freshness should be verified.

Geography

Australia and its continental margins