2019 Australian National Gravity Grids: Free Air Anomaly, Complete Bouguer Anomaly, De-tre
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Description
Over 1.8 million gravity observations from the 1940s to 2019 underpin these national grids. Geoscience Australia and GNS Science produced the 2019 series, which combines onshore ground data, offshore satellite altimetry data, and airborne gradiometry surveys totalling 451,000 line kilometers. The grids provide Free Air Anomaly, Complete Bouguer Anomaly, and De-trended Global Isostatic Residual values at a 400-meter cell size, an improvement from previous 800-meter versions.
Use Cases
Model crustal thickness and density variations based on Complete Bouguer Anomaly values.
Identify subsurface geological structures and mineral deposits using De-trended Global Isostatic Residual grids.
Integrate onshore and offshore gravity data for continental margin studies based on the combined data sources.
Refine regional geoid models using the high-resolution Free Air Anomaly grid.
Assess data quality and coverage for survey planning using the described station spacing and airborne survey lines.
Strengths
Incorporates nearly 1.4 million quality-controlled observations from the Australian National Gravity Database.
Combines multiple data sources: ground, airborne (451,000 line km), and global satellite-derived gravity.
Includes updated De-trended Global Isostatic Residual grids (v2) corrected for artefacts found in 2020.
Limitations
Column-level documentation is absent; field semantics must be inferred after download.
Row count is unknown, which may limit suitability assessment for specific analytical methods.
Provenance
Source
Geoscience Australia and the Institute of Geological and Nuclear Sciences Limited (GNS Science).
Collection Method
Grids calculated from gravity data in the Australian National Gravity Database, National Australian Geophysical Database, and the NOAA Global Gravity Grid.
Time Range
Data acquired from the 1940s to September 2019.
Freshness
Last updated 2026-04-10 21:42:29.500675; freshness should be verified.
Geography
Australia (onshore and offshore), supplemented with global data from the EGM2008 model.
Two grids (DGIR) were updated in October 2020; users of previous versions should download the v2 replacements. Data is provided in PDF and ZIP formats.