National Gravity Compilation 2019: Half Vertical Derivative Grid of Australia

Geoscience Australia produced the National Gravity Compilation 2019 DGIR 0.5VD image. This grid is derived from nearly 1.4 million gravity stations in the Australian National Gravity Database and offshore data, with ground observations collected from the 1940s to 2019. It represents the half vertical derivative of de-trended global isostatic residual anomalies over Australia and its continental margins at a cell size of approximately 435 meters.

Use Cases

• Map subsurface density variations based on processed gravity anomalies.
• Interpret geological structures for mineral exploration based on the derived DGIR grid.
• Model isostatic compensation and crustal thickness based on global isostatic residual corrections.
• Integrate gravity data with other geophysical datasets for regional geological analysis.

Strengths

• Derived from nearly 1.4 million gravity stations, supplemented by offshore data.
• Grid cell size is 0.00417 degrees (approximately 435m).
• Data quality was checked by GA geophysicists to be fit-for-purpose.
• Ground observations span from the 1940s to 2019, providing historical depth.

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 compilation of multiple government and industry sources.

Provenance

Source

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

Collection Method

Processed from ground observations and offshore data using standard geophysical methods, including isostatic corrections and a fast Fourier transform (FFT).

Time Range

Ground data collected from the 1940s to 2019.

Freshness

Last updated 2026-06-27 17:54:20.545736; freshness should be verified.

Geography

Australia and its continental margins.