National Gravity Compilation 2019: Airborne DGIR Grid for Australia

Geoscience Australia's National Gravity Compilation 2019 includes an airborne DGIR grid derived from approximately 1.8 million gravity 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. It provides de-trended global isostatic residual anomalies over Australia and its continental margins at a cell size of approximately 435 meters.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Integrate gravity data with other geophysical surveys for mineral exploration targeting.
• Analyze continental-scale tectonic features based on isostatic residual anomalies.
• Assess data quality and coverage for specific regions of Australia based on described station and line spacing.

Strengths

• Integrates nearly 1.4 million ground stations with over 450,000 line km of airborne surveys.
• Data quality is checked by GA geophysicists to ensure fitness-for-purpose.
• Combines data from multiple sources (Commonwealth, State, industry, universities) collected from the 1940s to present.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Freshness should be verified as the underlying data is from September 2019.

Provenance

Source

Australian Ocean Data Network, aggregating data from Geoscience Australia, Commonwealth/State/Territory Governments, industry, and universities.

Collection Method

Processed from ground observations, offshore global grids, and airborne surveys using standard geophysical methods and isostatic corrections.

Time Range

Data collected from the 1940s to present, compiled as of September 2019.

Freshness

Last updated 2026-06-04 05:36:17.449269; underlying data snapshot from September 2019.

Geography

Australia and its continental margins.