National Gravity Compilation 2019: Australian DGIR Grid

Australia's continental gravity anomalies from a compilation of nearly 1.8 million observations. The grid combines ground, airborne, and offshore data from the 1940s onward, processed to show de-trended global isostatic residual anomalies. It was produced by Geoscience Australia and incorporates data from government, industry, and research sources.

Use Cases

• Model subsurface geological structures based on gravity anomaly patterns.
• Assist mineral exploration by identifying density variations in the crust.
• Integrate with other geophysical datasets for comprehensive regional studies.
• Validate and calibrate airborne gravity survey methodologies.
• Study continental-scale geodynamic processes based on isostatic residual data.

Strengths

• Compiles approximately 1.8 million gravity observations from multiple sources.
• Incorporates 345,000 line km of airborne gravity and 106,000 line km of airborne gravity gradiometry data.
• Grid cell size is 0.00417 degrees (approximately 435m), providing regional detail.
• Data quality was checked by GA geophysicists to ensure fitness for purpose.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data may reflect geographic bias inherent to the compilation of disparate sources over decades.
• Last updated 2026-05-05 00:40:58.943116; freshness should be verified.

Provenance

Source

Australian Ocean Data Network, Geoscience Australia (GA), Commonwealth, State and Territory Governments, mining industry, universities.

Collection Method

Processed from ground observations in the Australian National Gravity Database, offshore global gravity grids, and airborne surveys.

Time Range

Data acquired from the 1940s to September 2019.

Freshness

Last updated 2026-05-05 00:40:58.943116

Geography

Australia and its continental margins.