National Gravity Compilation 2019 DGIR Tilt Image of Australia

Geoscience Australia's 2019 DGIR tilt image visualizes gravity anomalies across 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. Ground data was collected by government, industry, and research organizations from the 1940s to 2019.

Use Cases

• Map subsurface geological structures based on gravity anomaly edges detected by the tilt filter.
• Interpret continental-scale crustal density variations based on the de-trended global isostatic residual (DGIR) anomalies.
• Integrate gravity data with other geophysical datasets for regional geological modeling.
• Assess data coverage and station density for planning new gravity surveys in Australia.

Strengths

• Derived from nearly 1.4 million gravity station observations.
• Incorporates data from multiple sources collected over decades, from the 1940s to 2019.
• Processed and quality-checked by GA geophysicists to be fit-for-purpose.
• 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.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic or source bias inherent to the compilation of historical surveys.

Provenance

Source

Australian Ocean Data Network, aggregating data from Commonwealth, State/Territory Governments, industry, universities, and research organizations.

Collection Method

Grid generated from ground observations in the Australian National Gravity Database and offshore data from the Scripps Institution of Oceanography/NOAA/NGA global grid.

Time Range

1940s to 2019

Freshness

Last updated 2026-06-23 03:53:51.539874; freshness should be verified.

Geography

Australia and its continental margins