National Gravity Compilation 2019 DGIR Tilt Grid for Australia

Geoscience Australia's National Gravity Compilation 2019 DGIR tilt grid is a geophysical dataset derived from nearly 1.4 million ground and marine gravity observations. The grid has a cell size of 0.00417 degrees (approximately 435m) and shows a tilt of de-trended global isostatic residual anomalies over Australia and its continental margins. The data were processed from the Australian National Gravity Database as of September 2019 and offshore data from the Scripps Institution of Oceanography.

Use Cases

• Edge detection of geological units based on the tilt filter applied to the DGIR grid.
• Subsurface geological structure interpretation based on gravity anomaly measurements.
• Integration with other geophysical datasets for regional geological modeling based on the continental-scale coverage.

Strengths

• Derived from nearly 1.4 million gravity stations, providing a substantial observational base.
• Incorporates ground data collected from the 1940s to present day, offering a long temporal baseline.
• Combines terrestrial data from the Australian National Gravity Database with v28.1 of the Global Gravity grid for offshore coverage.
• Processed and quality-checked by GA geophysicists to be 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.
• Station spacing for ground observations varies from 11 km to less than 1 km, indicating uneven spatial resolution.

Provenance

Source

Geoscience Australia Data, supplemented by Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Ground and marine gravity observations processed via standard methods, with a tilt filter applied via FFT to the DGIR grid.

Time Range

Ground data from the 1940s to September 2019.

Freshness

Last updated 2026-04-20 02:39:47.562311; freshness should be verified.

Geography

Australia and its continental margins.