National Gravity Compilation 2019: Airborne Tilt Grid of Australia

Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and over 450,000 line kilometers of airborne surveys, were used to create this grid. Geoscience Australia compiled and quality-checked the data, which integrates ground observations from the 1940s onward with offshore and airborne sources. The resulting grid has a cell size of 0.00417 degrees and shows the tilt filter of complete Bouguer anomalies over Australia and its continental margins.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Identify potential mineral and resource deposits based on density variations in the crust.
• Integrate gravity data with other geophysical surveys for enhanced geological interpretation.
• Study continental margin structures based on the inclusion of offshore bathymetry data.

Strengths

• Integrates approximately 1.8 million observations from multiple sources, including ground, airborne, and offshore data.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Terrain corrections were applied using both onshore topography and offshore bathymetry data.
• Airborne data with line spacing from 0.5 km to 2.5 km provides better resolution in areas with poor ground data quality.

Limitations

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

Provenance

Source

Geoscience Australia Data

Collection Method

Processed from the Australian National Gravity Database and supplemented with global gravity grids and airborne surveys.

Time Range

Ground data collected from the 1940s to September 2019.

Freshness

Last updated 2026-05-14 09:11:37.433727; freshness should be verified.

Geography

Australia and its continental margins.