National Gravity Compilation 2019: DGIR 0.5VD Grid for Australia

Nearly 1.8 million gravity observations, including 1.4 million ground stations and 451,000 line km of airborne surveys, were used to generate this grid. The Australian Ocean Data Network released this dataset, which provides a half vertical derivative of de-trended global isostatic residual gravity anomalies over Australia and its continental margins. Data were compiled from the Australian National Gravity Database as of September 2019, supplemented by global sources and airborne surveys, with ground data collection spanning from the 1940s to the present.

Use Cases

• Map subsurface geological structures based on gravity anomaly data.
• Interpret crustal density variations for mineral exploration targeting.
• Model isostatic compensation and tectonic features based on the de-trended global isostatic residual (DGIR) grid.
• Enhance regional geological maps in areas with sparse ground data using integrated airborne gravity surveys.

Strengths

• Integrates approximately 1.8 million observations from ground, airborne, and global sources.
• Includes 345,000 line km of Airborne Gravity and 106,000 line km of Airborne Gravity Gradiometry data for improved resolution.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Grid has a cell size of 0.00417 degrees (approximately 435m), providing detailed spatial resolution.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic and temporal bias inherent to the aggregation of surveys from the 1940s onward.

Provenance

Source

Australian Ocean Data Network, incorporating data from the Australian National Gravity Database and global grids from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Processed from ground and airborne gravity observations via standard methods, including Fast Fourier Transform (FFT) calculations.

Time Range

Ground data spans from the 1940s to September 2019.

Freshness

Last updated 2026-06-27 18:19:40.934903; freshness should be verified.

Geography

Australia and its continental margins.