National Gravity Compilation 2019 includes airborne - CSCBA 0.5VD image

Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and airborne surveys totaling 451,000 line kilometers, were used to generate this grid. The dataset is a half vertical derivative image of complete Bouguer anomalies derived from the 2019 Australian National Gravity Grids B series, processed by Geoscience Australia. It integrates ground data from the Australian National Gravity Database, offshore global gravity data, and airborne surveys to reveal sub-surface geological structure.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Enhancing mineral exploration targeting by identifying density contrasts in the crust.
• Integrating gravity data with other geophysical surveys for regional geological interpretation.
• Conducting geophysical research on Australia's continental margins using combined onshore and offshore data.

Strengths

• Integrates approximately 1.8 million observations from multiple sources including ground, airborne, and global datasets.
• Includes 451,000 line kilometers of airborne gravity and gravity gradiometry data to improve resolution in areas with poor ground data quality.
• Data quality is checked by Geoscience Australia geophysicists to ensure it is fit-for-purpose.
• Grid cell size is 0.00417 degrees (approximately 435 meters), providing a detailed spatial resolution.

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 and temporal bias inherent to the aggregation of surveys from the 1940s to 2019.

Provenance

Source

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

Collection Method

Processed from ground observations, airborne surveys, and global gravity grids using standard geophysical methods and Fast Fourier Transform (FFT).

Time Range

Surveys from the 1940s to 2019, with the grid representing data as of September 2019.

Freshness

Last updated 2026-05-14 09:38:12.170830; freshness should be verified.

Geography

Australia and its continental margins.