National Gravity Compilation 2019 DGIR Tilt Image of Australia

A geospatial grid of de-trended global isostatic residual (DGIR) tilt anomalies covering Australia and its continental margins. The grid is derived from nearly 1.4 million gravity stations in the Australian National Gravity Database and offshore data, with a cell size of approximately 435 meters. Geoscience Australia produced this image from the 2019 Australian National Gravity Grids A series, incorporating ground data collected from the 1940s onward.

Use Cases

• Detecting edges of geological units based on the tilt filter applied to gravity anomalies.
• Mapping subsurface geological structure based on processed gravity data.
• Supporting mineral and resource exploration based on density variations in the Earth's crust.

Strengths

• Derived from nearly 1.4 million gravity stations, providing a substantial observational foundation.
• Incorporates ground data with station spacing as dense as less than 1 km in parts of the continent.
• Processed and quality-checked by Geoscience Australia geophysicists to be fit-for-purpose.

Limitations

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

Provenance

Source

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

Collection Method

Ground and marine gravity observations processed via standard methods and a fast Fourier transform (FFT) to create a tilt filter grid.

Time Range

Ground data collected from the 1940s to present, compiled as of September 2019.

Freshness

Last updated 2026-04-30 15:31:12.059923; freshness should be verified.

Geography

Australia and its continental margins.