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Jongnam, The dcreanal (and dcreanal2) converters I provided use the COARDS convention NetCDF files with attributes of the reanalysis files to determine the standard parameter number in the ncarncep1.tbl file as the name to store the data in the GEMPAK file. In particular, the converter is looking for the attribute "GRIB_name" as well as "GRIB_id" or "gribparam" to determine the reanalysis parameter. It sounds as if your files with derived fields don't fit the CDL which I developed the program for. If you could send me a sample file or point me to the download location you obtained the data from, I can provide you with an update. Steve Chiswell Unidata User Support > >Date: Thu, 11 Mar 2004 15:15:03 -0600 >From: Jongnam Choi <address@hidden> >To: address@hidden >cc: address@hidden >Subject: Converting NetCDF files to gempak files > >Hi folks, > >I am in desperate need for any advice on how to convert >NCEP/NCAR Reanalysis files (****.nc) to gempak file format. > >I usually use "dcreanal" decode in GEMPAK5.6 to decode NetCDF files. >Common yearly necCDF files of both pressure level and surface level data such >as geopotential height, air temperature, U-wind, V-wind, etc are fine. > >BUT >whenever I try to decode any averaged NetCDF files such as daily averaged data > , >monthly average data, etc... I failed to decode. >After this messages, then no actual decoding process goes. > >Changing center table to cntgrib1.tbl >Changing vertical coord table to vcrdgrib1.tbl >Changing WMO parameter table to ncarncep1.tbl >Changing center parameter table to ncarncep1.tbl > > >Please help me how to handle this problem. > >Thanks in advance. > >Jongnam Choi > > > > > > > >------- End of Forwarded Message > -- NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publically available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.