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The ECMWF interpolation software library EMOSLIB also provides the capability to interpolate spectral data to regular gaussian grids or regular lat-lon grids, and interpolate regular gaussian grids to regular lat-lon grids.
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The grid specified for the --regular option follows the grid naming convention for EMOSLIB here: Reduced Gaussian Grids.
Another command can be found in the 'tools' directory. This allows the interpolation function to be specified and is more flexible:
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A workaround is to use the -t ecmwf option. The -t option tells CDO to use the predefined ECMWF parameter tables This will make CDO use ECMWF parameter table 128 for the definitions of variables but 128 is only for GRIB 1. This will work for the surface fields which are encoded by IFS as GRIB 1, but not for the multi-level fields which are encoded in GRIB 2. Variable names become 'unknown' if -t ecmwf is used with the multi-level fields. It is best to omit it completely, even for surface fields, and only use it for GRIB 1 data if you get missing variable names after CDO has converted the data (see CDO documentation for more details).
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