National Gravity Compilation 2019: Airborne DGIR 1VD Grid for Australia

Nearly 1.8 million gravity observations, including ground stations and 451,000 line km of airborne surveys, were used to create this 2019 grid. The Australian Ocean Data Network released this geophysical dataset, which shows the first vertical derivative of de-trended global isostatic residual anomalies. Data sources span from the 1940s to the present day, compiled from government, industry, and research organizations.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Enhance mineral exploration targeting by interpreting the high-resolution airborne gravity gradiometry data.
• Calibrate regional geophysical models using the combined ground and offshore gravity data sources.
• Study crustal density variations across Australia and its continental margins.

Strengths

• Integrates approximately 1.4 million ground stations with 345,000 line km of airborne gravity and 106,000 line km of airborne gravity gradiometry data.
• Grid cell size is 0.00417 degrees (approximately 435m), providing regional detail.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Combines data from multiple sources (Commonwealth, State, industry, universities) collected from the 1940s onward.

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 or source bias inherent to the compilation methods.

Provenance

Source

Australian Ocean Data Network, incorporating data from the Australian National Gravity Database and global sources.

Collection Method

Processed from the 2019 Australian National Gravity Grids B series, applying a fast Fourier transform to a DGIR grid.

Time Range

1940s to 2019 (with database snapshot as of September 2019).

Freshness

Last updated 2026-06-27 21:14:01.922117; freshness should be verified.

Geography

Australia and its continental margins.