National Gravity Compilation 2019 DGIR 1VD grid

Geoscience Australia's National Gravity Compilation 2019 DGIR 1VD grid is a processed gravity anomaly dataset over Australia and its continental margins. It is derived from nearly 1.4 million gravity stations from the Australian National Gravity Database and offshore sources, with a grid cell size of approximately 435 meters. The data represents the first vertical derivative of de-trended global isostatic residual anomalies, processed from observations collected from the 1940s to September 2019.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Identify density variations in the Earth's crust for mineral exploration based on processed gravity response.
• Integrate gravity data with other geophysical datasets for continental-scale geological studies.
• Analyze isostatic compensation and tectonic features based on the de-trended global isostatic residual anomalies.

Strengths

• Derived from nearly 1.4 million gravity stations, indicating a substantial observational base.
• Grid cell size of 0.00417 degrees (approximately 435m), suggesting a relatively high spatial resolution.
• Data quality checked by GA geophysicists and incorporates observations from the 1940s to 2019, indicating a long temporal span and vetting process.
• Combines ground observations from multiple government and industry sources with offshore data from Scripps, NOAA, and NGA.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific analytical methods.
• Station spacing varies from 11 km to less than 1 km, indicating uneven coverage across the continent.

Provenance

Source

Australian Ocean Data Network, incorporating data from Geoscience Australia, Commonwealth/State/Territory Governments, industry, universities, and Scripps Institution of Oceanography.

Collection Method

Ground and marine gravity observations processed via standard methods, including isostatic correction and Fast Fourier Transform.

Time Range

1940s to September 2019.

Freshness

Last updated 2026-05-05 05:13:42.866090; freshness should be verified.

Geography

Australia and its continental margins.