National Gravity Compilation 2019 DGIR Image: Gravity Anomalies Over Australia

A 2019 compilation of gravity anomaly data over Australia and its continental margins, derived from approximately 1.8 million gravity observations. The grid has a cell size of 0.00417 degrees (approximately 435m) and is given in units of um/s^2 (gravity units). Data was acquired by government, industry, and research organizations from the 1940s to 2019 and processed by Geoscience Australia.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Interpret density variations in the Earth's crust for mineral exploration.
• Analyze continental-scale geophysical features based on processed gravity grids.
• Integrate gravity data with other geospatial datasets for geological mapping.

Strengths

• Derived from nearly 1.4 million gravity stations from a total of approximately 1.8 million observations.
• Station spacing for ground observations varies from approximately 11 km down to less than 1 km.
• Processed data is checked for quality by GA geophysicists to ensure it is fit-for-purpose.
• Grid cell size is 0.00417 degrees (approximately 435m), providing a specific spatial resolution.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-05-05 01:52:00.697260; freshness should be verified.

Provenance

Source

Australian Ocean Data Network, Geoscience Australia, Commonwealth, State and Territory Governments, mining industry, universities.

Collection Method

Ground and marine gravity observations processed via standard methods to produce de-trended global isostatic residual anomalies.

Time Range

1940s to 2019

Freshness

2026-05-05 01:52:00.697260

Geography

Australia and its continental margins