National Gravity Compilation 2019: Airborne CSCBA 0.5VD Image of Australia

A gravity anomaly grid for Australia and its continental margins derived from nearly 1.8 million ground and airborne observations. The data were processed by Geoscience Australia (GA) and incorporate measurements from the 1940s to 2019, with a grid cell size of approximately 435 meters. This image specifically shows a half vertical derivative of the complete spherical cap Bouguer anomalies from the 2019 Australian National Gravity Grids B series.

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 studies.
• Conducting terrain corrections for gravity surveys using the described bathymetry and topography data.

Strengths

• Integrates approximately 1.8 million gravity observations from ground, airborne, and offshore sources.
• Includes nearly 1.4 million ground stations and over 450,000 line kilometers of airborne surveys for improved resolution.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Station spacing varies from 11 km to less than 1 km, with major parts of the continent between 2.5 and 7 km.

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 onward.

Provenance

Source

Geoscience Australia (GA), Australian National Gravity Database (ANGD), and global sources including Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Data were acquired via ground, airborne gravity, and airborne gravity gradiometry surveys, processed via standard methods and FFT, and compiled into a grid.

Time Range

1940s to 2019 (with grid derived from observations as of September 2019).

Freshness

Last updated 2026-06-27 21:34:42.324662; freshness should be verified.

Geography

Australia and its continental margins.