National Gravity Compilation 2019: CSCBA 0.5VD Image of Australia

Nearly 1.4 million gravity stations from the Australian National Gravity Database, combined with 345,000 line km of airborne gravity surveys, were used to create this grid. The Australian Ocean Data Network released this processed gravity anomaly image derived from ground and offshore 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 resolution of approximately 435 meters.

Use Cases

• Model subsurface geological structures based on density variations revealed by gravity anomalies.
• Interpret continental-scale geological features based on the processed Bouguer anomaly grid.
• Integrate gravity data with other geospatial datasets for resource exploration, leveraging the terrain-corrected observations.
• Analyze changes in Earth's crust density over Australia and its margins using the half vertical derivative transformation.

Strengths

• Incorporates nearly 1.4 million ground gravity stations and over 450,000 line km of airborne surveys.
• Data spans a long temporal range, with observations collected from the 1940s to 2019.
• Grid has a defined spatial resolution of 0.00417 degrees (approximately 435 meters).
• Processing includes terrain corrections using offshore bathymetry and onshore topography.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-05-05 01:23:26.348583; freshness should be verified.

Provenance

Source

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

Collection Method

Ground and airborne gravity observations processed via standard methods and a Fast Fourier Transform (FFT) to calculate a half vertical derivative.

Time Range

1940s to 2019

Geography

Australia and its continental margins