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Warning

Please note:
According to the WMO, the use of local tables in messages intended for non-local or international exchange is strongly discouraged.

First of all ask the data provider for any local tables/definitions which they used in their GRIB messages.

Step-by-step guide

Local

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A common candidate for local adaptation is the handling of local parameters. The standard parameter descriptions are contained in the files name.def, paramId.def, shortName.def and units.def in directories:

Code Block
languagebash
/usr/local/share/eccodes/definitions/grib[edition]

The parameter descriptions for a given centre are contained in the directories:

Code Block
languagebash
/usr/local/share/eccodes/definitions/grib[edition]/localConcepts/[centre:s]

So for example the GRIB edition 2 local parameters for DWD (centre=edzw) are defined in definitions/grib2/localConcepts/edzw and GRIB edition 1 local parameters for SMHI (centre=eswi) are in definitions/grib1/localConcepts/eswi.

The following in an example of the contents for the above files in order to handle ECMWF parameter Geopotential in GRIB edition 1:

Code Block
languagebash
title/usr/local/share/eccodes/definitions/grib1/localConcepts/ecmf/name.def
#Geopotential
'Geopotential' = {
    table2Version = 128 ;
    indicatorOfParameter = 129 ;
}
Code Block
languagebash
title/usr/local/share/eccodes/definitions/grib1/localConcepts/ecmf/paramId.def
#Geopotential
'129' = {
    table2Version = 128 ;
    indicatorOfParameter = 129 ;
}
Code Block
languagebash
title/usr/local/share/eccodes/definitions/grib1/localConcepts/ecmf/shortName.def
#Geopotential
'z' = {
    table2Version = 128 ;
    indicatorOfParameter = 129 ;
}
Code Block
languagebash
title/usr/local/share/eccodes/definitions/grib1/localConcepts/ecmf/units.def
#Geopotential
'm**2 s**-2' = {
    table2Version = 128 ;
    indicatorOfParameter = 129 ;
}

And for GRIB edition 2, the contents of the same files for parameter Potential temperature gradient are:

Code Block
languagebash
title/usr/local/share/eccodes/definitions/grib2/localConcepts/ecmf/name.def
#Potential temperature gradient
'Potential temperature gradient' = {
    discipline = 192 ;
    parameterCategory = 129 ;
    parameterNumber = 3 ;
}
Code Block
languagebash
title/usr/local/share/eccodes/definitions/grib2/localConcepts/ecmf/paramId.def
#Potential temperature gradient
'129003' = {
    discipline = 192 ;
    parameterCategory = 129 ;
    parameterNumber = 3 ;
}
Code Block
languagebash
title/usr/local/share/eccodes/definitions/grib2/localConcepts/ecmf/shortName.def
#Potential temperature gradient
'ptgrd' = {
    discipline = 192 ;
    parameterCategory = 129 ;
    parameterNumber = 3 ;
}
Code Block
languagebash
title/usr/local/share/eccodes/definitions/grib2/localConcepts/ecmf/units.def
#Potential temperature gradient
'K' = {
    discipline = 192 ;
    parameterCategory = 129 ;
    parameterNumber = 3 ;
}

Local Definitions (Local Use section)

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