National Gravity Compilation 2019: Half Vertical Derivative Grid of Australia

Geoscience Australia's National Gravity Compilation 2019 DGIR 0.5VD grid is a geospatial dataset derived from nearly 1.4 million gravity stations. The grid, with a cell size of approximately 435 meters, shows the half vertical derivative of de-trended global isostatic residual anomalies over Australia and its continental margins. Data originates from ground observations in the Australian National Gravity Database as of September 2019, supplemented by offshore data from Scripps Institution of Oceanography, NOAA, and NGA.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Interpret density variations in the Earth's crust for mineral exploration.
• Integrate gravity data with other geophysical surveys for regional geological studies.
• Analyze continental margin features using combined onshore and offshore gravity observations.

Strengths

• Derived from nearly 1.4 million gravity stations from a total of approximately 1.8 million observations.
• Combines ground data collected from the 1940s onward with offshore data from major international institutions.
• Grid cell size is 0.00417 degrees (approximately 435m), providing a specific spatial resolution.
• Data underwent quality checks by GA geophysicists to ensure it is fit-for-purpose.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Station spacing for ground observations varies from 11 km to less than 1 km, indicating uneven spatial resolution.

Provenance

Source

Geoscience Australia (GA), Australian Ocean Data Network.

Collection Method

Processed from ground observations in the Australian National Gravity Database and offshore data from Scripps Institution of Oceanography, NOAA, and NGA.

Time Range

Ground data collected from the 1940s to September 2019.

Freshness

Last updated 2026-06-04 06:50:57.206574; freshness should be verified.

Geography

Australia and its continental margins.