National Gravity Compilation 2019: DGIR 0.5VD Image for Australia

2019 Australian National Gravity Grids B series data processed to produce a half vertical derivative of de-trended global isostatic residual anomalies. The compilation integrates nearly 1.4 million ground gravity stations from the Australian National Gravity Database, 345,000 line km of airborne gravity surveys, and 106,000 line km of airborne gravity gradiometry, supplemented by offshore data from global sources. The grid was generated by Geoscience Australia (GA) from data collected by government, industry, and research organizations from the 1940s to 2019.

Use Cases

• Interpret subsurface geological structure based on processed gravity anomalies.
• Analyze continental-scale density variations based on the DGIR grid.
• Map regional geological features using the 435m cell resolution grid.
• Integrate ground and airborne gravity data for improved resolution in specific areas.

Strengths

• Integrates approximately 1.8 million gravity observations from multiple sources.
• Grid has a cell size of 0.00417 degrees (approximately 435m), providing regional detail.
• Data quality was checked by GA geophysicists to ensure fitness for purpose.
• Includes airborne data to improve resolution where ground data quality was insufficient.

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 source bias inherent to data_gov_au.

Provenance

Source

Australian Ocean Data Network, Geoscience Australia (GA).

Collection Method

Processed from ground observations in the Australian National Gravity Database (ANGD), airborne surveys, and global offshore grids.

Time Range

Data collected from the 1940s to 2019.

Freshness

Last updated 2026-04-16 16:25:10.303555; freshness should be verified.

Geography

Australia and its continental margins.