National Gravity Compilation 2019: Airborne DGIR 1VD Image of Australia

2019 gravity data compilation for Australia, derived from nearly 1.4 million ground stations and over 450,000 line kilometers of airborne surveys collected from the 1940s onward. The grid, with a cell size of approximately 435 meters, shows the first vertical derivative of de-trended global isostatic residual anomalies. It was produced by Geoscience Australia from the Australian National Gravity Database and global offshore data.

Use Cases

• Map subsurface geological structures based on gravity anomaly data.
• Enhance mineral exploration targeting using high-resolution airborne gravity and gradiometry data.
• Model continental crustal thickness and isostatic compensation based on the de-trended global isostatic residual (DGIR) grid.
• Integrate gravity data with other geophysical datasets for regional geological interpretation.

Strengths

• Integrates a large volume of data, including nearly 1.4 million ground stations and 451,000 line km of airborne surveys.
• Data quality is checked by GA geophysicists to ensure it is fit-for-purpose.
• Provides high spatial resolution with a grid cell size of approximately 435 meters and airborne line spacing as low as 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 aggregation of surveys from the 1940s to 2019.

Provenance

Source

Geoscience Australia (GA), Australian National Gravity Database (ANGD), Scripps Institution of Oceanography, NOAA, NGA.

Collection Method

Processed from ground observations, airborne gravity, and gravity gradiometry surveys, supplemented by a global gravity grid.

Time Range

1940s to 2019 (data collection), compiled as of September 2019.

Freshness

Last updated 2026-04-16 09:26:35.504863; freshness should be verified.

Geography

Australia and its continental margins.