National Gravity Compilation 2019: Half Vertical Derivative Grid of Australia

Geoscience Australia's National Gravity Compilation 2019 - CSCBA 0.5VD image is a processed gravity anomaly grid derived from ground and airborne observations. The grid is based on nearly 1.4 million gravity stations and over 450,000 line kilometers of airborne surveys, with data collected from the 1940s to 2019. It shows a half vertical derivative of complete Bouguer anomalies over Australia and its continental margins at a cell size of approximately 435 meters.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Identifying potential mineral exploration targets based on density contrasts in the crust.
• Integrating gravity data with other geophysical datasets for regional geological interpretation.
• Studying tectonic features and crustal thickness based on processed Bouguer anomalies.

Strengths

• Derived from a substantial observational base of nearly 1.4 million ground gravity stations.
• Incorporates over 450,000 line kilometers of airborne gravity and gradiometry surveys.
• Data collection spans a long temporal range from the 1940s to 2019.
• Processing includes terrain corrections using both offshore bathymetry and onshore topography.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and exact file size are unknown, which may limit suitability assessment.
• Station spacing varies from less than 1 km to 11 km, indicating uneven spatial resolution.

Provenance

Source

Australian Ocean Data Network, incorporating data from Geoscience Australia, Commonwealth/State/Territory Governments, industry, universities, and global sources.

Collection Method

Ground and airborne gravity observations processed via standard methods and a Fast Fourier Transform (FFT).

Time Range

1940s to 2019 (observation period), with a grid compilation date of 2019.

Freshness

Last updated 2026-06-27 18:45:09.933934; freshness should be verified.

Geography

Australia and its continental margins.