National Gravity Compilation 2019 DGIR Tilt Image of Australia

Nearly 1.4 million gravity stations from the Australian National Gravity Database, supplemented by global marine data, were used to create this 2019 grid. Geoscience Australia processed the data to produce a de-trended global isostatic residual (DGIR) tilt image with a cell size of approximately 435 meters. The ground observations were collected by various government, industry, and academic entities from the 1940s to 2019.

Use Cases

• Edge detection of geological units based on the tilt filter applied to the DGIR grid.
• Interpretation of sub-surface density variations based on processed gravity anomaly data.
• Regional geological mapping based on the continental-scale coverage of Australia and its margins.

Strengths

• Derived from nearly 1.4 million quality-checked gravity stations from a national database.
• Combines ground data collected over decades with a v28.1 global marine gravity grid.
• Processed using a tilt filter (FFT) specifically for detecting edges of geological units.
• Has a defined spatial resolution 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 or source bias inherent to the aggregated survey data.
• Freshness should be verified as the underlying gravity database snapshot is from September 2019.

Provenance

Source

Geoscience Australia Data, incorporating data from Commonwealth, State/Territory Governments, industry, universities, and global marine sources.

Collection Method

Ground and marine gravity observations processed via standard methods and a tilt filter (FFT).

Time Range

Ground data from the 1940s to 2019; compilation snapshot from September 2019.

Freshness

Last updated 2026-04-20 02:15:53.841270; underlying data snapshot from September 2019.

Geography

Australia and its continental margins.