National Gravity Compilation 2019: DGIR Tilt Grid for Australia

Nearly 1.8 million gravity observations, including ground stations and airborne surveys totaling 451,000 line km, were used to create this 2019 grid. The Australian Ocean Data Network compiled data from government, industry, and research sources dating from the 1940s to produce a tilt-filtered gravity anomaly map. The grid has a cell size of approximately 435 meters and covers Australia and its continental margins.

Use Cases

• Detect edges of geological units based on the tilt filter applied to gravity anomalies.
• Interpret subsurface geological structure based on processed gravity data measuring rock density changes.
• Improve resolution in areas with poor ground data quality using integrated airborne gravity and gradiometry surveys.

Strengths

• Integrates nearly 1.4 million ground gravity stations and 451,000 line km of airborne surveys.
• Data sourced from multiple entities over a long temporal range, from the 1940s to present day.
• Processed and quality-checked by GA geophysicists to ensure fitness for purpose.
• Grid cell size of approximately 435 meters provides a detailed 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 bias inherent to data_gov_au, focusing on Australia.

Provenance

Source

Australian Ocean Data Network

Collection Method

Processed from the 2019 Australian National Gravity Grids B series, combining ground observations from the Australian National Gravity Database and offshore data from Scripps Institution of Oceanography.

Time Range

Data acquired from the 1940s to present day, compiled as of September 2019.

Freshness

Last updated 2026-06-23 02:31:14.576229; freshness should be verified.

Geography

Australia and its continental margins.