National Gravity Compilation 2019 DGIR Tilt Grid for 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 from the Australian National Gravity Database and offshore data, with a cell size of approximately 435 meters. It was produced by Geoscience Australia from ground and marine data collected from the 1940s to September 2019.

Use Cases

• Detecting edges of geological units based on the tilt filter derived from the DGIR anomalies.
• Mapping subsurface density variations based on processed gravity anomaly data.
• Interpreting continental-scale geological structure based on the national gravity compilation.
• Integrating gravity data with other geophysical surveys for regional analysis.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense spatial coverage.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Incorporates ground data from the 1940s to 2019 and global marine data, offering long-term and multi-source integration.
• Station spacing in major parts of the continent is between 2.5 and 7 km, suggesting detailed regional resolution.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific computational tasks.
• Data may reflect geographic and temporal bias inherent to the aggregation of historical surveys.

Provenance

Source

Geoscience Australia (GA), Australian National Gravity Database, and global marine data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Processed from ground and marine gravity observations using standard methods and a Fast Fourier Transform (FFT) to calculate a tilt filter.

Time Range

1940s to September 2019.

Freshness

Last updated 2026-06-27 19:18:00.890683; freshness should be verified.

Geography

Australia and its continental margins.