Australian National Gravity Anomaly Grid 2019 with Airborne Data
Updated 2mo ago
3filesAPPLICATION/X-NETCDF
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Description
Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and 451,000 line km of airborne surveys, were used to generate this free air anomaly grid. The grid, with a cell size of approximately 435 meters, covers Australia and its continental margins and is derived from data collected from the 1940s to September 2019. The data was processed and quality-checked by Geoscience Australia (GA) geophysicists, incorporating observations from government, industry, and research sources.
Use Cases
Model subsurface geological structures based on gravity anomaly measurements.
Identify potential mineral or hydrocarbon resources based on density variations in the crust.
Integrate with other geophysical datasets (e.g., magnetic) for comprehensive geological interpretation.
Study regional tectonic features and crustal thickness based on the free air anomaly grid.
Strengths
Integrates approximately 1.8 million observations from multiple sources (ground, airborne, offshore).
Includes high-resolution airborne gravity and gradiometry data (451,000 line km total) to improve data quality in sparse areas.
Station spacing varies from 11 km to less than 1 km, with major parts of the continent between 2.5 and 7 km.
Data has been processed via standard methods and quality-checked by GA 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 for specific computational tasks.
Provenance
Source
Geoscience Australia (GA), Australian National Gravity Database (ANGD), Scripps Institution of Oceanography, NOAA, NGA.
Collection Method
Grid derived from ground observations, offshore global gravity data, and airborne gravity/gradiometry surveys.
Time Range
1940s to September 2019.
Freshness
Last updated 2026-04-10 19:03:59.392273; freshness should be verified.
Geography
Australia and its continental margins.
Data is provided in NetCDF format, which requires specific geospatial or scientific software to read and process.