National Gravity Compilation 2019: Airborne CSCBA 0.5VD Image of Australia

Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and over 450,000 line km of airborne surveys, were used to create this 2019 gravity anomaly grid. Geoscience Australia compiled the data from Commonwealth, State, industry, and university sources, with measurements dating from the 1940s to 2019. The resulting grid has a cell size of 0.00417 degrees (about 435m) and covers Australia and its continental margins.

Use Cases

• Map subsurface geological structures based on gravity anomaly patterns.
• Identify potential mineral deposits based on density contrasts revealed in the gravity data.
• Integrate gravity data with other geophysical surveys for improved geological modeling.
• Train machine learning models for geophysical feature detection using the processed grid data.

Strengths

• Integrates approximately 1.8 million observations from multiple sources, including ground, airborne, and offshore data.
• Grid cell resolution is specified as 0.00417 degrees (approximately 435m).
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Includes terrain corrections calculated using offshore bathymetry and onshore topography.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count for the underlying point data is unknown, which may limit suitability assessment.
• The grid is derived from data current as of September 2019; more recent surveys may exist.

Provenance

Source

Geoscience Australia Data, compiled from the Australian National Gravity Database, global gravity grids, and airborne surveys.

Collection Method

Ground and airborne gravity measurements processed via standard methods and FFT to create a half vertical derivative grid.

Time Range

1940s to 2019 (measurement collection), with a grid snapshot from September 2019.

Freshness

Last updated 2026-04-20 03:07:50.269184; freshness should be verified.

Geography

Australia and its continental margins.