National Gravity Compilation 2019: CSCBA 0.5VD Grid

Australia's 2019 national gravity anomaly grid integrates approximately 1.8 million observations from ground stations, airborne surveys, and offshore data. The grid has a cell size of 0.00417 degrees (~435m) and shows a half vertical derivative of the Bouguer anomaly. It is derived from data collected from the 1940s to September 2019, processed with terrain corrections using bathymetry and topography.

Use Cases

• Mineral exploration targeting based on density contrasts revealed by gravity anomalies.
• Mapping subsurface geological structure for tectonic studies.
• Integrating gravity data with other geophysical datasets for resource assessment.
• Calibrating regional geophysical models using a standardized national compilation.

Strengths

• Integrates a large volume of data: nearly 1.4 million ground stations plus 345,000 line km of airborne gravity and 106,000 line km of airborne gravity gradiometry.
• Data quality is checked by GA geophysicists to ensure it is fit-for-purpose.
• Combines long-term historical data (1940s-present) with modern airborne and global datasets for comprehensive coverage.

Limitations

• Specific column names and data schema are not provided in the available metadata.
• License information is not explicitly stated across the sources.
• The grid is a processed derivative product, not the raw observation data.

Provenance

Source

Australian National Gravity Database (ANGD), supplemented by Scripps Institution of Oceanography's Global Gravity grid v28.1.

Collection Method

Data acquired by government, industry, and research organizations via ground and airborne surveys, processed with standard geophysical methods and terrain corrections.

Time Range

1940s to September 2019

Freshness

2026-05-05

Geography

Australia and surrounding offshore regions