![]() Grib_to_netcdf only works correctly when a single level coordinate is present in the GRIB file. For more details please see: grib_to_netcdf description. This command will convert one or more GRIB files to netCDF and is available with the ECMWF ecCodes software. for reanalysis products such as ERA-Interim/ERA-5), it is possible to download the files in netCDF format as well as GRIB. Please note that if using the MARS archive () (e.g. Also see controlling the OpenIFS output for more details of output fields and options. The ICMSH files are the spherical harmonics of the wind fields, pressure and temperature and require a spectral transform to convert to gridded data. The OpenIFS model outputs two types of files: those beginning with ICMSH contain fields represented as spherical harmonics, those that begin ICMGG contain gridpoint fields. The instructions below show how to work around this by splitting the file to separate fields on different vertical axes. ![]() ![]() This can cause a problem with some 3rd party tools, as the same GRIB variable code is used for each axis. GRIB files can also contain multiple vertical coordinates: pressure levels, model levels, sub-surface levels etc. These files are a mix of GRIB-1 & GRIB-2 messages, the multi-level fields are encoded as GRIB-2, whereas surface fields are GRIB-1. The OpenIFS/IFS models output in GRIB format. GRIB is a WMO standard and consists of GRIB Edition 1 and Edition 2. GRIB files are the file format used at ECMWF. It also describes different methods to interpolate the reduced Gaussian grid to regular grids. This article show different approaches to convert GRIB to netCDF for use in other analysis and visualisation software.
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