National Gravity Compilation 2019: Half-Derivative Bouguer Anomaly Grid for Australia

A gravity anomaly grid derived from approximately 1.8 million ground and airborne gravity observations across Australia and its continental margins. The grid has a cell size of 0.00417 degrees (approximately 435m) and shows the half vertical derivative of complete Bouguer anomalies, processed via Fast Fourier Transform. Data were compiled from the Australian National Gravity Database and global sources, with quality checks by Geoscience Australia geophysicists.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Identifying mineral and hydrocarbon exploration targets based on density contrasts revealed by the grid.
• Integrating gravity data with other geophysical datasets for regional geological interpretation.
• Conducting terrain correction analysis using the described bathymetry and topography data.

Strengths

• Derived from a substantial base of approximately 1.8 million gravity observations.
• Incorporates data from multiple sources, including 1.4 million ground stations and 451,000 line km of airborne surveys.
• Processed with standard methods and quality-checked by GA geophysicists to be fit-for-purpose.
• Provides continent-wide coverage of Australia and its margins with a consistent 435m resolution.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific analytical tasks.

Provenance

Source

Australian National Gravity Database and global gravity grids from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Ground and airborne gravity surveys processed via standard methods and FFT.

Time Range

Observations collected from the 1940s to September 2019.

Freshness

Last updated 2026-06-23 02:34:34.813073; freshness should be verified.

Geography

Australia and its continental margins.