Australian National Gravity Anomaly Grid with Airborne Data, 2019

A free air gravity anomaly grid for Australia and its continental margins, compiled in 2019. The grid incorporates nearly 1.4 million ground stations from the Australian National Gravity Database, 345,000 line km of airborne gravity data, and 106,000 line km of airborne gravity gradiometry. Data collection spans from the 1940s to the present day, sourced from government, industry, and research organizations.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Enhance mineral exploration targeting based on density variations in the crust.
• Integrate with magnetic or seismic datasets for multi-physics geophysical analysis.
• Map continental margin architecture based on offshore gravity data sourced from global grids.

Strengths

• Integrates multiple data sources: approximately 1.8 million observations from ground, airborne, and global offshore grids.
• Provides high-resolution coverage with a grid cell size of approximately 435 meters.
• Data quality is checked by GA geophysicists to ensure it is fit-for-purpose.

Limitations

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

Provenance

Source

Australian Ocean Data Network, incorporating data from Commonwealth, State, Territory Governments, industry, universities, and global sources (Scripps Institution of Oceanography, NOAA, NGA).

Collection Method

Standard processing of gravity observations to isolate the response from subsurface rocks.

Time Range

1940s to 2019

Freshness

Last updated 2026-06-04 06:22:12.679889; freshness should be verified.

Geography

Australia and its continental margins