National Gravity Compilation 2019: Airborne Tilt Image of Australia

Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and over 450,000 line km of airborne surveys, were used to generate this grid. The dataset is a processed gravity anomaly grid with a 435m cell size, derived from the Australian National Gravity Database and global offshore data, released by Geoscience Australia. It includes terrain corrections and an airborne tilt filter image of complete Bouguer anomalies over Australia and its continental margins.

Use Cases

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

Strengths

• Integrates approximately 1.8 million observations from multiple sources, including ground, airborne, and global data.
• Data quality is checked by GA geophysicists to ensure it is fit-for-purpose.
• Provides high resolution with station spacing as low as 1 km in parts and airborne line spacing from 0.5 km.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data may reflect geographic and temporal bias inherent to the aggregated sources, with ground data collected from the 1940s onward.

Provenance

Source

Geoscience Australia, incorporating data from Commonwealth, State, Territory Governments, industry, universities, and global sources like Scripps Institution of Oceanography.

Collection Method

Standard processing of ground, airborne, and offshore gravity measurements, with terrain corrections applied.

Time Range

Ground data from the 1940s to September 2019, with the grid compiled in 2019.

Freshness

Last updated 2026-04-20 03:01:33.762992; freshness should be verified.

Geography

Australia and its continental margins.