National Gravity Compilation 2019: 0.5VD Grid of Australia and Continental Margins

Nearly 1.8 million gravity observations, including 1.4 million ground stations and 451,000 line kilometers of airborne surveys, were processed to create this 2019 grid. Geoscience Australia compiled data from Commonwealth, State, industry, and university sources dating from the 1940s to present. The resulting 0.00417-degree cell grid shows a half vertical derivative of complete Bouguer anomalies for geological interpretation.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly measurements.
• Integrating ground and airborne gravity data to improve resolution in areas with sparse ground coverage.
• Applying terrain corrections using combined offshore bathymetry and onshore topography data.
• Analyzing continental-scale geophysical features using a first vertical derivative calculated via FFT.

Strengths

• Integrates approximately 1.8 million observations from multiple sources, including 1.4 million ground stations.
• Combines ground, airborne gravity, and gravity gradiometry data totaling 451,000 line kilometers for improved coverage.
• Uses data acquired from the 1940s to present, providing a long historical baseline.
• Grid cell size of 0.00417 degrees (approximately 435m) offers fine spatial resolution.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for large-scale ML projects.
• Data may reflect geographic and temporal bias inherent to the aggregation of surveys over decades.

Provenance

Source

Geoscience Australia Data, incorporating the Australian National Gravity Database and global data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Data acquired via ground observations, airborne gravity, and airborne gravity gradiometry surveys, processed with standard methods and terrain corrections.

Time Range

1940s to 2019 (with database snapshot as of September 2019).

Freshness

Last updated 2026-05-14 09:00:39.933609; freshness should be verified.

Geography

Australia and its continental margins.