National Gravity Compilation 2019: Airborne Tilt Grid of Australia

A 2019 compilation of gravity data for Australia and its continental margins, derived from nearly 1.4 million ground stations and over 450,000 line kilometers of airborne surveys. The grid, with a cell size of approximately 435 meters, shows the tilt filter of complete Bouguer anomalies. It was produced by Geoscience Australia using data from government, industry, and academic sources dating from the 1940s onward.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Enhancing geological maps in areas with sparse ground data using integrated airborne gravity and gradiometry.
• Conducting terrain corrections for geophysical surveys using the included bathymetry and topography data.

Strengths

• Integrates a large volume of data, including nearly 1.4 million ground stations and over 450,000 line km of airborne surveys.
• Provides high-resolution coverage with a grid cell size of approximately 435 meters and station spacing as low as 1 km in parts.
• Combines multiple data sources, including ground observations, offshore global gravity data, and airborne measurements for improved resolution.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data freshness should be verified; the underlying national gravity database was current as of September 2019.
• Row count is unknown, which may limit suitability assessment for large-scale statistical analysis.

Provenance

Source

Geoscience Australia Data

Collection Method

Processed from the Australian National Gravity Database and global gravity grids, incorporating ground, airborne, and offshore data.

Time Range

1940s to 2019

Freshness

Last updated 2026-04-30 13:43:39.106769; freshness should be verified

Geography

Australia and its continental margins