National Gravity Compilation 2019: Airborne Half-Vertical Derivative Image of Australia

Australia and its continental margins are covered by this gravity anomaly grid derived from nearly 1.8 million observations. The grid combines ground data from the Australian National Gravity Database, offshore data from global sources, and airborne gravity and gradiometry surveys totaling 451,000 line kilometers. Geoscience Australia processed the data, which was collected from the 1940s to 2019, to produce a half-vertical derivative image with a cell size of approximately 435 meters.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly patterns.
• Enhancing mineral exploration targeting by interpreting density variations in the crust.
• Integrating with magnetic or seismic data for regional geophysical synthesis.
• Studying continental margin architecture using the offshore gravity data component.

Strengths

• Integrates approximately 1.8 million observations from multiple sources, including 1.4 million ground stations.
• Includes 451,000 line kilometers of airborne gravity and gradiometry data to improve resolution.
• Data quality was checked by GA geophysicists to be fit-for-purpose.
• Terrain corrections applied using both offshore bathymetry and onshore topography.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and specific file size are unknown, which may limit suitability assessment.
• Data freshness should be verified; the underlying compilation is from 2019.

Provenance

Source

Australian National Gravity Database, Global Gravity grid (Scripps Institution of Oceanography, NOAA, NGA), and various government and industry surveys.

Collection Method

Ground and airborne gravity observations processed via standard methods and FFT to create a half-vertical derivative grid.

Time Range

1940s to 2019

Freshness

Last updated 2026 04 28 13:39:14.620471; underlying data compiled as of September 2019.

Geography

Australia and its continental margins