National Gravity Compilation 2019 DGIR grid

Nearly 1.4 million gravity stations from the Australian National Gravity Database, supplemented by global marine data, were used to create this continental grid. The National Gravity Compilation 2019 DGIR grid shows de-trended global isostatic residual anomalies over Australia and its continental margins at a cell size of approximately 435 meters. Data were acquired by government, industry, and research bodies from the 1940s onward and processed by Geoscience Australia geophysicists to ensure fitness-for-purpose.

Use Cases

• Modeling subsurface geological structures based on density variations revealed by gravity anomalies.
• Mineral and resource exploration targeting based on interpreted crustal composition.
• Tectonic and basin analysis over the Australian continent and its margins.
• Integrating gravity data with other geophysical datasets (e.g., magnetic, seismic) for multi-survey interpretation.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense continental coverage.
• Station spacing in major parts of the continent is between 2.5 and 7 km, suggesting detailed regional resolution.
• Data underwent quality checking by GA geophysicists to ensure it is fit-for-purpose.
• Incorporates offshore data from a v28.1 global gravity grid sourced from institutions like Scripps and NOAA.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for some computational tasks.
• The description does not specify the license, which may restrict usage.

Provenance

Source

Australian Ocean Data Network, aggregating data from Geoscience Australia's National Gravity Database and global marine sources.

Collection Method

Grid generated from ground and marine gravity observations processed via standard methods and isostatic corrections.

Time Range

Data acquired from the 1940s to September 2019.

Freshness

Last updated 2026-06-05 07:53:16.326440; freshness should be verified.

Geography

Australia and its continental margins.