National Gravity Compilation 2019: Airborne DGIR 1VD Grid for Australia

A 2019 compilation integrates nearly 1.4 million ground gravity stations, 345,000 line km of airborne gravity, and 106,000 line km of airborne gravity gradiometry data. The grid shows the first vertical derivative of de-trended global isostatic residual anomalies over Australia and its continental margins at a 0.00417-degree cell size. Data were processed by Geoscience Australia from observations dating from the 1940s to 2019, supplemented by 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 density variations based on isostatic residual calculations.
• 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 over 450,000 line km of airborne surveys.
• Provides high spatial resolution with a grid cell size of approximately 435 meters.
• Data quality is checked by GA geophysicists to ensure it is fit-for-purpose.
• Combines historical data from the 1940s onward with modern airborne acquisitions for broad temporal coverage.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for some analytical methods.
• Data may reflect geographic bias inherent to data_gov_au, with variable station spacing across the continent.

Provenance

Source

Geoscience Australia Data

Collection Method

Processed from the 2019 Australian National Gravity Grids B series, derived from the Australian National Gravity Database and global offshore grids.

Time Range

1940s to 2019

Freshness

Last updated 2026-04-30 13:31:53.796288; freshness should be verified.

Geography

Australia and its continental margins