National Gravity Compilation 2019: Tilt Image of Australia's Subsurface

Geoscience Australia's National Gravity Compilation 2019 tilt image is derived from nearly 1.4 million ground gravity stations and offshore data. The grid has a cell size of approximately 435 meters and covers Australia and its continental margins. Data were collected from the 1940s to 2019 by government, industry, and research organizations.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Train computer vision models for geophysical feature detection based on the tilt-filtered image.
• Integrate with other geospatial datasets for regional resource assessment based on the described continental coverage.
• Analyze long-term changes in gravity data collection based on the 1940s-present time range mentioned.

Strengths

• Derived from nearly 1.4 million gravity stations from a total of approximately 1.8 million observations.
• Grid cell size is specified as 0.00417 degrees (approximately 435m).
• Data quality was checked by GA geophysicists to ensure fitness-for-purpose.
• Incorporates both onshore and offshore data, with terrain corrections applied.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic/temporal/source bias inherent to data_gov_au.

Provenance

Source

Geoscience Australia Data, supplemented with data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

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

Time Range

1940s to September 2019.

Freshness

Last updated 2026-03-25 15:50:44.881724; freshness should be verified.

Geography

Australia and its continental margins.