National Gravity Compilation 2019 DGIR Image of Australia

Nearly 1.4 million gravity stations from the Australian National Gravity Database, supplemented by global marine data, were used to generate this 2019 grid. Geoscience Australia processed these ground and offshore observations to produce a de-trended global isostatic residual anomaly image with a cell size of approximately 435 meters. The compilation integrates data collected by government, industry, and research organizations from the 1940s to 2019.

Use Cases

• Model subsurface geological structures based on density variations revealed by gravity anomalies.
• Identify potential mineral exploration targets based on interpreted geological features from the gravity grid.
• Integrate gravity data with other geophysical datasets for continental-scale crustal studies.
• Analyze spatial patterns of isostatic compensation over Australia and its continental margins.

Strengths

• Integrates approximately 1.8 million gravity observations, with nearly 1.4 million stations used from the national database.
• Station spacing for ground data varies from 11 km to less than 1 km, with major parts of the continent covered at 2.5 to 7 km intervals.
• Data underwent quality checking by GA geophysicists to ensure it is fit-for-purpose.
• Combines decades of data from the 1940s onward, sourced from government, industry, and academic projects.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Freshness should be verified; the underlying data is current as of September 2019.

Provenance

Source

Australian National Gravity Database (ANGD) and global marine data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Ground and marine gravity observations processed via standard methods to produce a de-trended global isostatic residual grid.

Time Range

1940s to 2019

Freshness

Last updated 2026-04-28 14:57:08.362939; underlying data current as of September 2019.

Geography

Australia and its continental margins