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The general usage is the following:
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Convert from NetCDF to RPN format: cdf2rpn -rpn RPN_standard_file -cdf NetCDF_file -attr attribut_list Convert from RPN to NetCDF format - one needs to add the key '-dir' (for 'direction'): cdf2rpn -rpn RPN_standard_file -cdf NetCDF_file -attr attribut_list -dir |
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- If you do not add a path to the output file name the file will end up in $TMPDIR!!!
- All fields in a file must have the same timesteps and levels.
You cannot have i.e. sigma, hybrid, arbitrary and pressure levels in the same file!!! Nor can there be, for example, a field on 20 pressure levels and another on only 1 pressure level. If your RPN input file contains fields with different types or numbers of levels you can select the fields your want to convert with 'r.diag' and/or 'editfst' - see above. - If converting RPN to NetCDF make sure your RPN file contains all necessary grid descriptors ('^^', '>>', '^>', 'HY','!!')
- All variables you want to convert need to be in the attribute list. - see below.
Attribute list
The attribute list is a file. It can be considered as a dictionary to translate between RPN ↔ netCDF.
You can find an example file on the UQAM servers under: ~winger/Scripts/NetCDF_converter/attribut_netcdf.dat
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The file consists of:
1) Documentation
At the beginning are several commented lines containing information about the file.
2) Coordinate variables
The first section of this file, after the comments, contains a list of coordinate variables. Do not modify this section!!! It is limited by
#---------------- Variables coordonnees (debut) (NE PAS MODIFIER) ---------------------
:
#---------------- Variables coordonnees (fin) (NE PAS MODIFIER) ------------------------
3) Global attributes
The second section contains the global attributes. Global attributes are related to the dataset as a whole and should be used to provide a description of the dataset.
4) Fields / Variables
The last section needs to contain an entry for each field/variable that is to be converted. Each entry starts with 'def_attribut' and needs to have the form below.
Make sure the factors are correct!!!
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def_attribut[ name; ccname; mult; add; Where: name: noms netCDF OBLIGATOIRE |
Notes:
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- Unit conversion from RPN → netCDF:
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- unit(RPN) = mult*
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- unit(netCDF)+
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- add
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- Unit conversion from netCDF → RPN :
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- unit(netCDF)= (
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- unit(RPN)-add)/
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- mult
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- 'nom_attribut
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- = ...' are only used for conversions to
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- netCDF format.
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- Never put a space before the ";"!
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- "[", "]", "="
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- and ";" are reserved characters.
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- Do not use them otherwise, for example in names or descriptions.