Australian National Gravity Compilation 2019 with Airborne Tilt Grid

A gravity anomaly grid for Australia and its continental margins, derived from approximately 1.8 million ground, airborne, and offshore gravity observations. The grid has a cell size of 0.00417 degrees (approximately 435m) and incorporates data from the 1940s to September 2019. Geoscience Australia processed and quality-checked the data, which includes nearly 1.4 million ground stations, 345,000 line km of airborne gravity, and 106,000 line km of airborne gravity gradiometry.

Use Cases

• Map subsurface density variations based on the complete Bouguer anomaly grid.
• Interpret geological structures for mineral exploration using the high-resolution airborne gravity and gradiometry data.
• Model continental margin geology by integrating offshore gravity data from global sources.
• Assess terrain corrections for gravity surveys using the integrated bathymetry and topography data.

Strengths

• Integrates a large volume of observations, including nearly 1.4 million ground stations and over 450,000 line km of airborne surveys.
• Provides high spatial resolution with a grid cell size of approximately 435 meters.
• Combines multiple data sources (ground, airborne, offshore) collected from the 1940s to 2019 for comprehensive coverage.
• Data underwent quality assurance checks by Geoscience Australia geophysicists.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Station and line spacing varies across the continent, which may create inconsistencies in data density.
• Row count is unknown, which may limit suitability assessment for specific analytical methods.

Provenance

Source

Geoscience Australia Data, incorporating data from Commonwealth, State, Territory Governments, industry, universities, and global sources (Scripps Institution of Oceanography, NOAA, NGA).

Collection Method

Processed from the Australian National Gravity Database and global grids, with standard geophysical methods and terrain corrections applied.

Time Range

1940s to September 2019

Freshness

Last updated 2026-03-25 17:20:16.378558; freshness should be verified.

Geography

Australia and its continental margins