National Gravity Compilation 2019: Airborne DGIR Image of Australia

A 2019 compilation of gravity data for Australia and its continental margins, derived from approximately 1.8 million observations. The dataset includes ground measurements from the Australian National Gravity Database, supplemented by 345,000 line km of airborne gravity and 106,000 line km of airborne gravity gradiometry data, as well as offshore data from global sources. It was processed by Geoscience Australia to produce a de-trended global isostatic residual anomaly image with a cell size of approximately 435 meters.

Use Cases

• Modeling subsurface geological structures based on density variations revealed by gravity anomalies.
• Enhancing mineral exploration targeting by interpreting the processed gravity grid.
• Integrating airborne and ground gravity data to improve resolution in areas with sparse ground coverage.
• Conducting geophysical research on continental crust using the de-trended isostatic residual anomalies.

Strengths

• Integrates a large volume of data, including nearly 1.4 million ground stations and over 450,000 line km of airborne surveys.
• Combines multiple data sources, including government, industry, and academic surveys collected from the 1940s onward.
• Processed and quality-checked by Geoscience Australia geophysicists to be fit-for-purpose.
• Provides high-resolution coverage with ground station spacing as low as 1 km and airborne line spacing as low as 0.5 km.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• The description metadata is limited; actual data quality and structure require manual inspection after download.

Provenance

Source

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

Collection Method

Standard processing of gravity measurements from ground, airborne, and offshore sources, compiled into a national grid.

Time Range

Surveys from the 1940s to 2019, compiled as of September 2019.

Freshness

Last updated 2026-05-14 09:34:52.141648; freshness should be verified.

Geography

Australia and its continental margins.