National Gravity Compilation 2019: Airborne DGIR 0.5VD Image of Australia

Australia and its continental margins are covered by this gravity anomaly image derived from the 2019 Australian National Gravity Grids. The grid integrates nearly 1.4 million ground stations and over 450,000 line kilometers of airborne gravity and gradiometry data collected from the 1940s to 2019. It is produced by Geoscience Australia from the National Gravity Database and supplemented by global offshore data.

Use Cases

• Map subsurface geological structures based on gravity anomaly data.
• Interpret crustal density variations for mineral exploration targeting.
• Integrate airborne and ground gravity data for regional geological modeling.
• Apply isostatic and trend corrections to gravity data for enhanced feature resolution.

Strengths

• Integrates approximately 1.8 million gravity observations from ground and airborne sources.
• Includes nearly 1.4 million ground stations and 451,000 line km of airborne data.
• Data quality is checked by GA geophysicists to be fit-for-purpose.
• Grid has a cell size of 0.00417 degrees (approximately 435m).

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 bias inherent to data_gov_au, with variable station spacing.

Provenance

Source

Australian National Gravity Database (ANGD), Global Gravity grid from Scripps Institution of Oceanography, NOAA, NGA.

Collection Method

Processed from ground observations, airborne gravity, and gravity gradiometry surveys.

Time Range

1940s to 2019.

Freshness

Last updated 2026-06-04 10:14:58.132001; freshness should be verified.

Geography

Australia and its continental margins.