National Gravity Compilation 2019: Tilt Image of Australia at 435m Resolution

A gravity anomaly tilt image derived from the 2019 Australian National Gravity Grids. The grid is based on nearly 1.4 million gravity stations from the Australian National Gravity Database, supplemented with offshore data, and has a cell size of approximately 435 meters. Geoscience Australia compiled the data from government, industry, and academic sources, with observations collected from the 1940s to September 2019.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Training computer vision models for geophysical feature detection using the processed tilt image.
• Integrating gravity data with other geospatial layers for mineral exploration.
• Analyzing continental margin geology based on combined onshore and offshore data.

Strengths

• Derived from nearly 1.4 million gravity stations out of approximately 1.8 million total observations.
• Grid cell size of 0.00417 degrees (approximately 435m) provides high spatial resolution.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Incorporates data from the 1940s to 2019, offering long-term temporal coverage.

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 gravity database snapshot is from September 2019.

Provenance

Source

Geoscience Australia Data, compiled from Commonwealth, State, Territory Governments, mining industry, universities, and research organisations.

Collection Method

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

Time Range

1940s to September 2019

Freshness

Last updated 2026-04-20 03:35:40.433820; underlying data snapshot from September 2019.

Geography

Australia and its continental margins