National Gravity Compilation 2019: DGIR 0.5VD Grid for Australia

A 2019 compilation of gravity data over Australia and its continental margins, derived from approximately 1.8 million observations. The grid has a cell size of 0.00417 degrees (approximately 435m) and shows the half vertical derivative of de-trended global isostatic residual anomalies. Data was sourced from the Australian National Gravity Database, global gravity grids, and airborne surveys, processed and quality-checked by Geoscience Australia.

Use Cases

• Model subsurface geological structures based on gravity anomalies.
• Interpret density variations in the Earth's crust based on processed gravity data.
• Integrate gravity data with other geospatial datasets for regional geological analysis.
• Assess the quality and resolution of gravity data in areas supplemented by airborne surveys.

Strengths

• Derived from approximately 1.8 million gravity observations, including nearly 1.4 million ground stations.
• Incorporates airborne gravity and gradiometry data totaling 345,000 line km and 106,000 line km respectively to improve resolution.
• Data quality was checked by GA geophysicists to ensure fitness for purpose.
• Grid cell size of 0.00417 degrees provides a consistent 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 compilation of historical and varied source data.

Provenance

Source

Australian Ocean Data Network via data_gov_au

Collection Method

Processed from ground observations, offshore global grids, and airborne surveys using standard geophysical methods and FFT.

Time Range

Data acquired from the 1940s to September 2019.

Freshness

Last updated 2026-05-05 01:40:21.973003; freshness should be verified.

Geography

Australia and its continental margins.