National Gravity Compilation 2019: Free Air Anomaly Grid for Australia

A free air gravity anomaly grid for Australia and its continental margins, derived from ground observations and offshore data. The grid incorporates nearly 1.4 million gravity stations from the Australian National Gravity Database, with station spacing ranging from 11 km to less than 1 km. It was processed by GA geophysicists and released by the Australian Ocean Data Network.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Analyze rock density variations across the Australian continent based on gravity measurements.
• Support mineral and resource exploration efforts based on interpreted geological features.
• Integrate gravity data with other geophysical datasets for comprehensive crustal studies.

Strengths

• Incorporates nearly 1.4 million gravity stations from a national database.
• Station spacing is detailed, ranging from 11 km down to less than 1 km.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Grid has a fine cell size of approximately 435 meters (0.00417 degrees).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data freshness should be verified despite the 2026 metadata update date.
• The description does not specify the exact license terms for use.

Provenance

Source

Australian Ocean Data Network, incorporating data from Commonwealth, State, and Territory Governments, industry, universities, and research organisations.

Collection Method

Ground gravity observations processed via standard methods and supplemented with offshore data from Scripps Institution of Oceanography, NOAA, and NGA.

Time Range

Data collected from the 1940s to September 2019.

Freshness

Last updated 2026-06-27 19:59:29.270224; freshness should be verified.

Geography

Australia and its continental margins.