National Gravity Compilation 2019 DGIR Tilt Grid for Australia

September 2019 compilation of approximately 1.8 million gravity observations processed into a tilt grid with a 435m cell size. The grid is derived from ground data in the Australian National Gravity Database and offshore data from Scripps Institution of Oceanography, NOAA, and NGA. It shows de-trended global isostatic residual anomalies to highlight edges of geological units.

Use Cases

• Detecting edges of geological units based on the tilt filter derived from gravity anomalies.
• Modeling subsurface density variations based on processed gravity data.
• Integrating ground and marine gravity data for continental-scale geological interpretation.

Strengths

• Derived from nearly 1.4 million gravity stations and marine data, providing broad coverage.
• Ground data spans from the 1940s to present day, offering a long historical record.
• Station spacing in major parts of the continent is between 2.5 and 7 km, indicating detailed sampling.
• 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.

Provenance

Source

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

Collection Method

Ground and marine gravity observations processed via standard methods and FFT to create a tilt grid.

Time Range

Data from the 1940s to September 2019.

Freshness

Last updated 2026-06-04 09:01:09.872838; freshness should be verified.

Geography

Australia and its continental margins.