National Gravity Compilation 2019: Airborne DGIR 0.5VD Grid for Australia

Australia and its continental margins are covered by this gravity anomaly grid derived from nearly 1.8 million ground and airborne observations. The grid, with a cell size of approximately 435 meters, shows the half vertical derivative of de-trended global isostatic residual anomalies. Geoscience Australia produced this compilation from data collected from the 1940s to 2019, integrating ground stations, 345,000 line km of airborne gravity, and 106,000 line km of airborne gravity gradiometry.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Enhancing mineral exploration targeting by integrating airborne and ground gravity surveys.
• Improving resolution in areas with sparse ground data using airborne gravity gradiometry.
• Conducting regional geophysical studies of the Australian continent and its margins.

Strengths

• Integrates a large volume of observations, including nearly 1.4 million ground stations and extensive airborne surveys totaling 451,000 line km.
• Combines data from multiple sources and decades (1940s to 2019) for a national-scale perspective.
• Uses specialized processing (DGIR, half vertical derivative) to highlight geological features.
• Provides a standardized grid with a defined resolution of approximately 435 meters.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic or source bias inherent to the compilation methods.

Provenance

Source

Geoscience Australia Data

Collection Method

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

Time Range

1940s to 2019

Freshness

Last updated 2026-04-30 12:32:12.539609; freshness should be verified.

Geography

Australia and its continental margins