Australian National Gravity Grid with Airborne Tilt Image, 2019

Australia and its continental margins are covered by a gravity anomaly grid with a cell size of approximately 435 meters. The grid integrates nearly 1.4 million ground stations, 345,000 line km of airborne gravity data, and 106,000 line km of airborne gravity gradiometry, compiled from sources dating from the 1940s to 2019. It was processed by Geoscience Australia (GA) and includes offshore data from the Scripps Institution of Oceanography.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Enhance mineral exploration targeting by analyzing density contrasts revealed by the tilt filter.
• Integrate gravity data with other geophysical surveys for regional geological interpretation.
• Assess terrain corrections for gravity measurements using the included bathymetry and topography data.

Strengths

• Integrates multiple data sources: ~1.4 million ground stations, 345,000 line km of airborne gravity, and 106,000 line km of airborne gradiometry.
• Provides high-resolution coverage with station spacing as low as 1 km and airborne line spacing from 0.5 km to 2.5 km.
• Data quality is checked by GA geophysicists to ensure it is fit-for-purpose.
• Includes terrain corrections calculated from both offshore bathymetry and onshore topography.

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 and temporal bias inherent to the aggregation of historical surveys.

Provenance

Source

Geoscience Australia (GA), Australian National Gravity Database (ANGD), Scripps Institution of Oceanography, NOAA, NGA.

Collection Method

Standard processing of ground, airborne, and offshore gravity observations, with terrain corrections.

Time Range

1940s to September 2019.

Freshness

Last updated 2026-04-10 19:45:37.666475; freshness should be verified.

Geography

Australia and its continental margins.