National Gravity Compilation 2019: Airborne Tilt Grid of Australia

A gravity anomaly grid for Australia and its continental margins, derived from approximately 1.8 million ground and airborne gravity observations. The grid has a cell size of 0.00417 degrees (approximately 435m) and was compiled by Geoscience Australia using data from the 1940s to September 2019. It incorporates ground data from the Australian National Gravity Database, offshore data from global sources, and airborne surveys totaling 451,000 line kilometers.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Enhancing geological maps in areas with sparse ground data using integrated airborne surveys.
• Conducting geophysical research on continental margins using the combined onshore and offshore gravity grid.

Strengths

• Integrates a large volume of observations, including nearly 1.4 million ground stations and 451,000 line km of airborne data.
• Provides improved resolution in areas with poor ground data quality through the inclusion of airborne gravity and gradiometry.
• Applies terrain corrections using both offshore bathymetry and onshore topography data.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data may reflect geographic and temporal bias inherent to the aggregation of surveys from the 1940s onward.

Provenance

Source

Geoscience Australia Data, incorporating data from Commonwealth, State, Territory Governments, industry, universities, and global sources.

Collection Method

Processed from ground observations, airborne surveys, and global gravity grids using standard geophysical methods.

Time Range

1940s to September 2019

Freshness

Last updated 2026-04-20 02:22:47.938509; freshness should be verified.

Geography

Australia and its continental margins