National Gravity Compilation 2019: DGIR 1VD Image of Australia

Geoscience Australia's National Gravity Compilation 2019 includes an airborne-derived first vertical derivative of de-trended global isostatic residual (DGIR) anomalies. The grid integrates nearly 1.8 million observations, including ground stations, 345,000 line km of airborne gravity, and 106,000 line km of airborne gravity gradiometry data from the 1940s onward. It covers Australia and its continental margins with a cell size of approximately 435 meters.

Use Cases

• Map subsurface geological structures based on gravity anomaly data.
• Identify potential mineral exploration targets based on density contrasts revealed by the DGIR grid.
• Integrate gravity data with other geophysical datasets for regional geological modeling.
• Assess the quality and coverage of gravity data across different parts of the Australian continent.

Strengths

• Integrates a large volume of data: nearly 1.8 million gravity observations.
• Combines multiple data sources: ground stations, airborne gravity (345,000 line km), and airborne gravity gradiometry (106,000 line km).
• Covers a long temporal range, with data acquired from the 1940s to the present day.
• Describes a specific, processed derivative product (DGIR 1VD) useful for geological interpretation.

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

Australian Ocean Data Network, Geoscience Australia

Collection Method

Processed from the 2019 Australian National Gravity Grids B series, integrating ground observations, offshore global gravity data, and airborne surveys.

Time Range

1940s to 2019

Freshness

Last updated 2026-06-23 00:39:26.346242; freshness should be verified.

Geography

Australia and its continental margins