National Gravity Compilation 2019: Airborne DGIR 1VD 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 create this grid. The Australian Ocean Data Network compiled data from government, industry, and research sources dating from the 1940s to 2019. It shows the first vertical derivative of de-trended global isostatic residual anomalies over Australia and its continental margins at a 435m cell size.

Use Cases

• Map subsurface geological structures based on gravity anomaly data.
• Enhance resolution in areas with poor ground data quality using integrated airborne gravity and gradiometry surveys.
• Interpret crustal density variations for tectonic studies based on the processed DGIR grid.

Strengths

• Integrates nearly 1.8 million observations from ground, airborne gravity (345,000 line km), and airborne gravity gradiometry (106,000 line km) sources.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Combines data from the Australian National Gravity Database with global offshore data from Scripps Institution of Oceanography, NOAA, and NGA.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Station spacing for ground observations varies widely from 11 km to less than 1 km, which may affect local resolution consistency.

Provenance

Source

Australian Ocean Data Network, aggregating data from Commonwealth, State and Territory Governments, the mining and exploration industry, universities, and research organisations.

Collection Method

Processed from the 2019 Australian National Gravity Grids B series, applying a fast Fourier transform (FFT) to the DGIR grid.

Time Range

1940s to 2019

Freshness

Last updated 2026-06-23 03:31:10.909747; freshness should be verified.

Geography

Australia and its continental margins