National Gravity Compilation 2019: Half Vertical Derivative Grid of Australia

The 2019 Australian National Gravity Grids A series, incorporating data from the 1940s to September 2019, provides a processed gravity anomaly image for Australia and its continental margins. It is derived from approximately 1.8 million gravity observations, including ground stations, airborne gravity surveys, and offshore data. The grid, with a cell size of approximately 435 meters, shows a half vertical derivative of complete Bouguer anomalies, processed by Geoscience Australia and other government, industry, and research bodies.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Aiding mineral and resource exploration by identifying density variations in the crust.
• Integrating with other geophysical datasets (e.g., magnetic, seismic) for comprehensive geological interpretation.
• Conducting terrain correction analysis using the described bathymetry and topography data.

Strengths

• Derived from a large composite source of nearly 1.8 million gravity observations.
• Incorporates data from multiple sources and decades (1940s to 2019), providing historical depth.
• Processed with standard methods and quality-checked by GA geophysicists, as stated in the description.
• Includes terrain corrections calculated using both offshore bathymetry and onshore topography.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and specific sample data are unknown, which may limit suitability assessment.
• Data may reflect geographic or source bias inherent to the compilation methods.

Provenance

Source

Australian National Gravity Database (ANGD), Global Gravity grid from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Ground and airborne gravity surveys, processed via standard methods and FFT to create a half vertical derivative grid.

Time Range

1940s to September 2019

Freshness

Last updated 2026-06-23 04:34:50.687835; freshness should be verified.

Geography

Australia and its continental margins