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| Warning |
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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 |
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/usr/local/share/eccodes/definitions/grib[edition] |
The parameter descriptions for a given centre are contained in the directories:
| Code Block |
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/usr/local/share/eccodes/definitions/grib[edition]/localConcepts/[centre:s]
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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:
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| language | bash |
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| title | /usr/local/share/eccodes/definitions/grib1/localConcepts/ecmf/name.def |
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#Geopotential
'Geopotential' = {
table2Version = 128 ;
indicatorOfParameter = 129 ;
} |
| Code Block |
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| language | bash |
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| title | /usr/local/share/eccodes/definitions/grib1/localConcepts/ecmf/paramId.def |
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#Geopotential
'129' = {
table2Version = 128 ;
indicatorOfParameter = 129 ;
} |
| Code Block |
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| language | bash |
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| title | /usr/local/share/eccodes/definitions/grib1/localConcepts/ecmf/shortName.def |
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#Geopotential
'z' = {
table2Version = 128 ;
indicatorOfParameter = 129 ;
} |
| Code Block |
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| language | bash |
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| title | /usr/local/share/eccodes/definitions/grib1/localConcepts/ecmf/units.def |
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#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 |
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| language | bash |
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| title | /usr/local/share/eccodes/definitions/grib2/localConcepts/ecmf/name.def |
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#Potential temperature gradient
'Potential temperature gradient' = {
discipline = 192 ;
parameterCategory = 129 ;
parameterNumber = 3 ;
} |
| Code Block |
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| language | bash |
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| title | /usr/local/share/eccodes/definitions/grib2/localConcepts/ecmf/paramId.def |
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#Potential temperature gradient
'129003' = {
discipline = 192 ;
parameterCategory = 129 ;
parameterNumber = 3 ;
} |
| Code Block |
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| language | bash |
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| title | /usr/local/share/eccodes/definitions/grib2/localConcepts/ecmf/shortName.def |
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#Potential temperature gradient
'ptgrd' = {
discipline = 192 ;
parameterCategory = 129 ;
parameterNumber = 3 ;
} |
| Code Block |
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| language | bash |
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| title | /usr/local/share/eccodes/definitions/grib2/localConcepts/ecmf/units.def |
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#Potential temperature gradient
'K' = {
discipline = 192 ;
parameterCategory = 129 ;
parameterNumber = 3 ;
} |
Local Definitions (Local Use section)
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