National Gravity Compilation 2019 CSCBA 1VD image

Nearly 1.4 million gravity stations from the Australian National Gravity Database, supplemented with offshore data, were used to generate this 2019 grid. The image shows the first vertical derivative of the complete Bouguer anomalies over Australia and its continental margins, derived from a grid with a cell size of approximately 435 meters. Ground gravity data was acquired by government, industry, and research organizations from the 1940s to the present day.

Use Cases

• Map subsurface density variations based on the first vertical derivative of Bouguer anomalies.
• Model geological structures for mineral exploration based on processed gravity anomaly data.
• Integrate with other geophysical datasets for continental-scale geological interpretation based on the national grid.
• Study tectonic features and crustal thickness based on terrain-corrected gravity measurements.

Strengths

• Derived from nearly 1.4 million gravity stations in the Australian National Gravity Database as of September 2019.
• Grid cell size is 0.00417 degrees (approximately 435m), providing a detailed spatial resolution.
• Incorporates data acquired from the 1940s to present day by multiple government and research entities.
• Terrain corrections were applied using both offshore bathymetry and onshore topography data.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-06-04 07:38:07.355509; freshness should be verified.

Provenance

Source

Australian Ocean Data Network, incorporating data from the Australian National Gravity Database and Scripps Institution of Oceanography/NOAA/NGA global grid.

Collection Method

Ground and marine gravity observations processed via standard methods, with a first vertical derivative calculated via Fast Fourier Transform on a spherical cap Bouguer anomaly grid.

Time Range

1940s to 2019

Freshness

Data reflects observations as of September 2019, with metadata updated in June 2026.

Geography

Australia and its continental margins