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| Before downloading data check if your processing software supports the GRIB and/or NetCDF formats. If your software supports both, use GRIB as first choice. If your software supports only NetCDF or if you run into problems with GRIB, use the NetCDF format. |
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Currently there are two different coding standards: GRIB edition 1 (commonly referred to as GRIB1) and GRIB edition 2 (GRIB2). The major differences are in the structure of the messages; in GRIB2, several variables are defined with more precision (e.g. in GRIB1, latitudes and longitudes are in milli-degrees while in GRIB2, they are in micro-degrees). Also in GRIB2, longitude values must lie between 0 and 360 degrees), the encoding of the parameter is very different, and in GRIB2 the description of the data is template/table based. Note that a GRIB file can contain a mix of GRIB1 and GRIB2 messages.
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- ecCodes by ECMWF
- Supports GRIB to NetCDF conversion (grib_to_netcdf -o netcdf_file grib_file)
- Supports GRIB to JSON (grib_dump -j <gribfile>)
- See tools and code examples for Fortran, Python and C
- CDO info operators (info, infon, sinfo, sinfon)
- NCO
- GrADS
- wgrib2, only for GRIB edition 2, wgrib2 can not cannot decode GRIB edition 1 files
- IDL
- the GDAL library, with limited support for coordinate systems, georeferencing and metadata. In particular irregular (non-cartesian) coordinate systems might not be decoded correctly.
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This document has been produced in the context of the Copernicus AtmosphereAtmosphere Monitoring Service (CAMS) and theCopernicus Climate Change Service (C3S). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of CAMS and C3S on behalf of the European Union (Delegation Agreement signed on 11/11/2014 and Contribution Agreement signed on 22/07/2021). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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