National Gravity Compilation 2019 with Airborne Tilt Image

Gravity anomaly data derived from ground observations, airborne surveys, and offshore sources covering Australia and its continental margins. The compilation integrates nearly 1.8 million gravity observations, including 1.4 million ground stations and over 450,000 line kilometers of airborne gravity and gradiometry data. The processed grid has a cell size of approximately 435 meters and was quality-checked by Geoscience Australia geophysicists.

Use Cases

• Model subsurface density variations based on complete Bouguer anomaly data.
• Interpret geological structure using tilt-filtered gravity anomaly imagery.
• Enhance regional geological maps by integrating airborne gravity gradiometry data.
• Assess terrain corrections for gravity surveys using integrated bathymetry and topography data.

Strengths

• Integrates data from multiple sources: approximately 1.8 million observations from ground, airborne, and offshore surveys.
• Provides high-resolution coverage with a grid cell size of approximately 435 meters and station spacing as low as 1 km in parts.
• Includes terrain corrections calculated 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.
• Last updated 2026-06-23 03:03:15.527341; freshness should be verified.

Provenance

Source

Australian Ocean Data Network, Geoscience Australia, Commonwealth/State/Territory Governments, mining industry, universities, Scripps Institution of Oceanography, NOAA, NGA.

Collection Method

Ground, airborne, and shipborne gravity measurements processed via standard methods and compiled into a national grid.

Time Range

1940s to September 2019.

Freshness

2026-06-23

Geography

Australia and its continental margins.