Gravity Anomaly Grid of Australia Combining Onshore and Satellite Data

Australian Ocean Data Network provides a gravity anomaly grid for the Australian region from 2009. The grid combines accurate onshore gravity measurements with satellite data offshore, with cell values representing Bouguer anomalies onshore and free-air anomalies offshore. The grid has a cell size of 0.5 arc minutes, approximately 800 meters.

Use Cases

• Model subsurface density variations based on Bouguer anomaly values.
• Map geological structures and tectonic boundaries based on gravity anomaly gradients.
• Integrate offshore free-air anomaly data with onshore measurements for continental-scale geophysical studies.

Strengths

• Grid cell size is specified as 0.5 arc minutes (approximately 800 meters), providing a defined spatial resolution.
• Combines two data sources: accurate onshore gravity measurements and satellite data for offshore coverage.
• Specific anomaly types and reference density (2.67 tonnes per cubic metre for onshore Bouguer anomalies) are defined.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for large-scale statistical modeling.

Provenance

Source

Australian Ocean Data Network

Collection Method

Combination of onshore gravity measurements and satellite-derived gravity data.

Time Range

2009

Freshness

Last updated 2026-06-04 07:45:12.993224; freshness should be verified.

Geography

Australian region