Australian Gravity Anomaly Grid with Airborne Data, 2019

Approximately 1.8 million gravity observations, including 1.4 million ground stations and 345,000 line km of airborne gravity data, were compiled by Geoscience Australia and other organizations. The data spans from the 1940s to 2019 and covers Australia and its continental margins with a grid cell size of 0.00417 degrees (~435m). The compilation integrates ground, airborne, and offshore data to produce a tilt-filtered image of complete Bouguer anomalies.

Use Cases

• Model subsurface geological density structures based on gravity anomaly measurements.
• Integrate airborne gravity data to improve resolution in areas with sparse ground data.
• Perform terrain corrections for gravity data using bathymetry and topography.
• Analyze continental-scale geophysical features using a tilt-filtered Bouguer anomaly grid.
• Combine historical ground data (1940s-present) with modern airborne surveys for temporal analysis.

Strengths

• Integrates nearly 1.4 million ground stations with 345,000 line km of airborne gravity and 106,000 line km of airborne gravity gradiometry.
• Grid cell resolution of 0.00417 degrees (~435m) provides continent-scale detail.
• Data quality is checked by GA geophysicists to ensure fitness for purpose.
• Combines data from multiple sources (government, industry, academia) over a long temporal range.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic/temporal bias inherent to the collection methods and sources.

Provenance

Source

Geoscience Australia (GA), Commonwealth, State and Territory Governments, mining industry, universities, research organizations, Scripps Institution of Oceanography, NOAA, NGA.

Collection Method

Processed from the Australian National Gravity Database (ANGD) and Global Gravity grid, supplemented with airborne surveys.

Time Range

1940s to 2019

Freshness

Last updated 2026-04-16 14:13:25.580674; freshness should be verified.

Geography

Australia and its continental margins