Australian Gravity Anomaly Grid with Airborne Data, 2019

Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and 451,000 line kilometers of airborne surveys, were used to create this national grid. The data was compiled by Geoscience Australia from government, industry, and research sources dating from the 1940s to 2019. It provides a tilt-filtered image of Bouguer anomalies over Australia and its continental margins.

Use Cases

• Model subsurface geological structures based on Bouguer gravity anomalies.
• Identify mineral and resource exploration targets based on density variations in the crust.
• Integrate gravity data with other geophysical surveys for regional geological mapping.
• Study continental margin geology using combined onshore and offshore gravity data.

Strengths

• Integrates approximately 1.8 million observations from multiple sources.
• Combines ground, airborne gravity, and airborne gravity gradiometry data totaling 451,000 line kilometers.
• Includes terrain corrections calculated using bathymetry and topography data.
• Has a national grid cell size of 0.00417 degrees (approximately 435 meters).

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 methods.

Provenance

Source

Australian National Gravity Database (ANGD), Global Gravity grid v28.1, and airborne surveys.

Collection Method

Standard processing of gravity observations, checked for quality by GA geophysicists.

Time Range

Data acquired from the 1940s to September 2019.

Freshness

Last updated 2026-05-05 02:12:36.021890; freshness should be verified.

Geography

Australia and its continental margins.