National Gravity Compilation 2019: DGIR 0.5VD Image of Australia

A processed gravity image grid representing the half vertical derivative of de-trended global isostatic residual anomalies over Australia and its continental margins. The grid has a cell size of approximately 435 meters and is derived from nearly 1.4 million gravity stations from the Australian National Gravity Database and marine data. The data was compiled by Geoscience Australia and other government, industry, and research organizations from observations dating from the 1940s to 2019.

Use Cases

• Interpret subsurface geological structure based on processed gravity anomaly data.
• Map density variations in the Earth's crust based on the half vertical derivative of isostatic residuals.
• Integrate gravity data with other geophysical datasets for continental-scale geological modeling.
• Analyze station spacing patterns for survey planning based on the described 2.5 to 7 km coverage.
• Validate gravity processing methods based on the described FFT and correction techniques.

Strengths

• Grid derived from nearly 1.4 million gravity stations, indicating a substantial observational base.
• Data quality checked by GA geophysicists to ensure fitness for purpose.
• Station spacing varies from 11 km to less than 1 km, with major parts of the continent covered at 2.5 to 7 km intervals.
• Incorporates offshore data from a global gravity grid developed by Scripps, NOAA, and NGA.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-04-16 14:54:02.311714; freshness should be verified.

Provenance

Source

Geoscience Australia (GA), Commonwealth, State and Territory Governments, mining industry, universities, and research organizations.

Collection Method

Ground and marine gravity observations processed via standard methods, including isostatic corrections and FFT.

Time Range

1940s to September 2019.

Freshness

Last updated 2026-04-16 14:54:02.311714

Geography

Australia and its continental margins.