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Description
A gravity anomaly grid of Australia and its continental margins derived from approximately 1.8 million ground and marine gravity observations. The grid represents the first vertical derivative of de-trended global isostatic residual anomalies, processed by Geoscience Australia from data collected from the 1940s to September 2019. It has a cell size of approximately 435 meters and integrates data from Australian government, industry, and academic sources, as well as global marine data from Scripps Institution of Oceanography, NOAA, and NGA.
Use Cases
Map subsurface geological structures based on gravity anomaly patterns.
Support mineral exploration targeting based on density contrasts in the crust.
Model regional tectonic features based on processed isostatic residual anomalies.
Integrate with other geophysical datasets for comprehensive geological interpretation.
Strengths
Derived from nearly 1.4 million gravity stations from the Australian National Gravity Database, supplemented by global marine data.
Ground data has been collected from the 1940s to present, providing a long-term observational record.
Station spacing in major parts of the continent is between 2.5 and 7 kilometers, suggesting detailed coverage.
Processed and quality-checked by Geoscience Australia geophysicists to be fit-for-purpose.
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 or temporal bias inherent to the aggregation of data from multiple sources over decades.
Provenance
Source
Geoscience Australia Data, integrating Commonwealth, State/Territory Governments, mining/exploration industry, universities, and research organisations.
Collection Method
Ground and marine gravity observations processed via standard methods, including isostatic corrections and Fast Fourier Transform (FFT) calculation.
Time Range
1940s to September 2019.
Freshness
Last updated 2026-05-14 03:39:53.477407; freshness should be verified.
Geography
Australia and its continental margins.
File format is APPLICATION/X-NETCDF, requiring compatible geospatial software for analysis.