National Gravity Anomaly Grid for Australia, 435m Resolution

Approximately 1.4 million gravity stations from the Australian National Gravity Database were used to generate this tilt grid. The grid has a cell size of 0.00417 degrees (approximately 435m) and covers Australia and its continental margins, incorporating ground data collected from the 1940s onward and offshore data from global sources. The processed data is checked for quality by Geoscience Australia geophysicists to ensure it is fit-for-purpose.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Support mineral and hydrocarbon exploration by mapping density variations in the crust.
• Integrate with other geophysical datasets (e.g., magnetic, seismic) for comprehensive regional studies.
• Calculate terrain corrections for gravity surveys using the described bathymetry and topography data.

Strengths

• Derived from nearly 1.4 million quality-checked gravity stations out of a total of approximately 1.8 million observations.
• Grid cell size of 0.00417 degrees (approximately 435m) provides a detailed spatial resolution.
• Incorporates data from multiple sources (government, industry, academia) collected over decades, from the 1940s to present.
• Terrain corrections were applied using both offshore bathymetry and onshore topography data.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and exact file size are unknown, which may limit suitability assessment.
• Data may reflect geographic and temporal bias inherent to the collection methods and source platforms.

Provenance

Source

Australian Ocean Data Network, incorporating data from Geoscience Australia, Commonwealth/State/Territory Governments, industry, and global sources (Scripps Institution of Oceanography, NOAA, NGA).

Collection Method

Ground and offshore gravity observations processed via standard methods, with a tilt filter applied to a spherical cap Bouguer anomaly grid.

Time Range

Ground data from the 1940s to September 2019.

Freshness

Last updated 2026-04-10 17:37:42.899689; freshness should be verified.

Geography

Australia and its continental margins.