National Gravity Compilation 2019: Airborne DGIR Tilt Image of Australia

Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and 451,000 line km of airborne surveys, were used to generate this 2019 grid. The dataset is a processed tilt image of de-trended global isostatic residual (DGIR) anomalies over Australia and its continental margins, derived from the 2019 Australian National Gravity Grids B series. Data were acquired by government, industry, and research organizations from the 1940s onward and quality-checked by Geoscience Australia (GA) geophysicists.

Use Cases

• Detect edges of geological units based on the tilt filter applied to the DGIR grid.
• Interpret subsurface geological structure based on processed gravity anomaly data.
• Supplement ground gravity surveys with higher-resolution airborne gravity and gradiometry data in areas of poor ground data quality.

Strengths

• Integrates approximately 1.8 million observations from multiple sources, including ground, airborne, and offshore data.
• Has a defined spatial resolution with a grid cell size of approximately 435 meters.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

Geoscience Australia (GA), supplemented by data from the Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Processed from ground observations, airborne surveys, and a global gravity grid using standard geophysical methods and a Fast Fourier Transform (FFT).

Time Range

Data acquired from the 1940s to 2019.

Freshness

Last updated 2026-06-27 17:48:44.921850; freshness should be verified.

Geography

Australia and its continental margins.