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

Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and over 450,000 line km of airborne surveys, were used to generate this grid. The dataset is a processed image showing the half vertical derivative of de-trended global isostatic residual (DGIR) gravity anomalies over Australia and its continental margins, produced by Geoscience Australia from the 2019 Australian National Gravity Grids B series. Data was compiled from ground observations, offshore global grids, and airborne surveys conducted by various government, industry, and research entities from the 1940s to 2019.

Use Cases

• Map subsurface geological structures based on gravity anomaly patterns.
• Enhance mineral exploration targeting by interpreting density variations in the crust.
• Integrate gravity data with other geophysical datasets for continental-scale modeling.
• Train machine learning models for geophysical feature detection using the processed gravity image.

Strengths

• Integrates a large volume of data: approximately 1.8 million gravity observations.
• Combines multiple data sources: ground stations, airborne gravity (345,000 line km), airborne gradiometry (106,000 line km), and global offshore data.
• Data has undergone quality checks by GA geophysicists to be fit-for-purpose.
• Provides high-resolution coverage with a grid cell size of approximately 435 meters.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data may reflect geographic and temporal bias inherent to the compilation of historical surveys from the 1940s onward.
• Row count and specific file size are unknown, which may limit suitability assessment.

Provenance

Source

Geoscience Australia Data, incorporating data from Commonwealth, State, and Territory Governments, the mining industry, universities, and research organisations.

Collection Method

Processed from the 2019 Australian National Gravity Grids B series, derived from ground observations in the Australian National Gravity Database (ANGD) and supplemented by offshore global gravity data and airborne surveys.

Time Range

1940s to 2019 (collection period for source data).

Freshness

Last updated 2026-03-25 17:19:00.084777; freshness should be verified.

Geography

Australia and its continental margins.