National Gravity Compilation 2019 with Airborne Tilt Image

Australia and its continental margins are covered by this gravity anomaly grid derived from approximately 1.8 million gravity observations. The grid combines ground data from the Australian National Gravity Database, offshore data from a global gravity grid, and airborne gravity surveys totaling 451,000 line kilometers. It was compiled by Geoscience Australia and partners using data collected from the 1940s to September 2019.

Use Cases

• Map subsurface geological structures based on gravity anomaly patterns.
• Integrate gravity data with other geophysical surveys for mineral exploration targeting.
• Model continental crustal thickness and density variations across Australia.
• Assess data coverage and resolution for specific regions based on described station and line spacing.

Strengths

• Integrates a large volume of data, including nearly 1.4 million ground stations and 451,000 line km of airborne surveys.
• Combines multiple data sources (ground, offshore, airborne) to improve resolution and coverage.
• Data underwent quality checks by GA geophysicists to ensure it is fit-for-purpose.
• Terrain corrections were applied using both offshore bathymetry and onshore topography data.

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 or temporal bias inherent to the compilation of historical and multi-source surveys.

Provenance

Source

Australian Ocean Data Network, Geoscience Australia (GA), Commonwealth/State/Territory Governments, mining industry, universities.

Collection Method

Processed from ground observations, offshore global grids, and airborne gravity/gradiometry surveys.

Time Range

1940s to September 2019

Freshness

Last updated 2026-06-27 17:49:03.589771; freshness should be verified.

Geography

Australia and its continental margins