National Gravity Compilation 2019: Airborne Half-Vertical Derivative Grid of Australia

Australia and its continental margins are covered by a gravity anomaly grid with a cell size of 0.00417 degrees (approximately 435m). The grid integrates nearly 1.4 million ground stations from the Australian National Gravity Database, 345,000 line km of airborne gravity, and 106,000 line km of airborne gravity gradiometry, with data collected from the 1940s to 2019. It is a processed half vertical derivative image of complete Bouguer anomalies, produced by Geoscience Australia and incorporating offshore data from Scripps Institution of Oceanography.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Identify potential mineral deposits based on density variations in the crust.
• Integrate gravity data with other geophysical surveys for regional geological interpretation.
• Study continental margin geology based on combined onshore and offshore gravity data.

Strengths

• Integrates a large volume of observations: nearly 1.4 million ground stations and 451,000 line km of airborne data.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Combines historical data (from the 1940s) with modern airborne surveys for improved resolution.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific computational tasks.

Provenance

Source

Geoscience Australia, Australian National Gravity Database, Scripps Institution of Oceanography.

Collection Method

Ground and airborne gravity observations processed via standard methods and FFT to create a grid.

Time Range

1940s to 2019.

Freshness

Last updated 2026-04-10 22:17:04.003495; freshness should be verified.

Geography

Australia and its continental margins.