Australian Gravity Anomaly Grid with Airborne Data, 2019

The 2019 Australian National Gravity Grids B series integrates approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and airborne surveys totaling 451,000 line km. It was compiled by Geoscience Australia (GA) from data acquired by government, industry, and research organizations from the 1940s to 2019. The grid has a cell size of 0.00417 degrees (approximately 435m) and includes terrain corrections from bathymetry and topography.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Integrate ground and airborne gravity data for regional geological mapping.
• Apply tilt filtering to Bouguer anomalies for enhanced feature interpretation.
• Combine offshore and onshore gravity data for continental margin studies.

Strengths

• Integrates approximately 1.8 million observations from multiple sources (ground, airborne gravity, airborne gradiometry).
• Includes terrain corrections calculated using offshore bathymetry and onshore topography data.
• Quality-checked by GA geophysicists to ensure data is fit-for-purpose.
• Cell size of 0.00417 degrees (approximately 435m) provides a standardized national grid.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data freshness should be verified as the last metadata update was 2026-06-04.

Provenance

Source

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

Collection Method

Processed from ground observations in the Australian National Gravity Database (ANGD), supplemented with offshore global gravity data and airborne gravity/gradiometry surveys.

Time Range

1940s to 2019

Freshness

Last metadata update was 2026-06-04; the underlying data compilation is from 2019.

Geography

Australia and its continental margins