National Gravity Compilation 2019: Half-Vertical Derivative Grid of Australia

Approximately 1.4 million gravity stations from the Australian National Gravity Database, supplemented by offshore data, were used to generate this grid. The data represents the half vertical derivative of de-trended global isostatic residual anomalies over Australia and its continental margins, with a cell size of approximately 435 meters. Geoscience Australia compiled the data from ground observations collected by various government and research entities from the 1940s onward, combined with global marine gravity data.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Identifying potential mineral exploration targets based on density contrasts in the crust.
• Integrating gravity data with other geophysical datasets for continental-scale geological interpretation.
• Training machine learning models for geophysical pattern recognition using processed gravity grids.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense continental coverage.
• Integrates decades of ground observations (1940s-present) with a consistent global marine gravity model.
• Processed via standard geophysical methods and quality-checked by Geoscience Australia geophysicists.
• Station spacing in major parts of the continent is between 2.5 and 7 kilometers, indicating detailed sampling.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific computational tasks.
• The description metadata is technical but lacks direct sample data or a full schema for immediate use.

Provenance

Source

Geoscience Australia Data, incorporating data from Commonwealth, State, Territory Governments, industry, universities, and the Scripps Institution of Oceanography/NOAA/NGA global grid.

Collection Method

Ground gravity observations processed via standard methods and FFT transformation, combined with offshore data from the v28.1 Global Gravity grid.

Time Range

Ground observations from the 1940s to present; compilation snapshot as of September 2019.

Freshness

Last updated 2026-03-25 18:30:30.267682; based on data as of September 2019.

Geography

Australia and its continental margins.