National Gravity Compilation 2019 DGIR Tilt Grid for Australia

Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations, were used to generate this grid. The data were compiled by Geoscience Australia from ground observations dating from the 1940s to 2019, supplemented by offshore data from global sources. This grid shows a tilt of de-trended global isostatic residual anomalies, processed to detect edges of geological units across Australia and its continental margins.

Use Cases

• Detecting edges of geological units based on the tilt filter derived from the DGIR grid.
• Modeling subsurface density variations based on processed gravity anomaly data.
• Supporting mineral and resource exploration based on interpreted geological structure.
• Conducting regional-scale geophysical analysis based on continent-wide station spacing between 2.5 and 7 km.

Strengths

• Derived from approximately 1.8 million gravity observations, providing a substantial data foundation.
• Ground data spans from the 1940s to 2019, offering a long temporal range.
• Processed and quality-checked by GA geophysicists to be fit-for-purpose.
• Grid cell size of 0.00417 degrees (approximately 435m) provides a defined spatial resolution.

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/temporal/source bias inherent to the compilation method.

Provenance

Source

Geoscience Australia (GA), supplemented by data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Ground observations stored in the Australian National Gravity Database (ANGD) and offshore data from the Global Gravity grid, processed via standard methods and FFT.

Time Range

Ground data from the 1940s to September 2019.

Freshness

Last updated 2026-04-10 19:29:29.812539; freshness should be verified.

Geography

Australia and its continental margins.