NOTE: The decoders mailing list is no longer active. The list archives are made available for historical reasons.
Brian, Actually I don't know of any s/w to create GRIB files from netCDF. That isn't to say that there's not any out there or it can't be done. One can dump a netCDF file to stdout using a netCDF routine called ncdump. One would have to install netCDF and udunits, not a major under taking. Since the netCDF output from ncdump is usually large, it would probably be better to modify ncdump to write to a grib file. The hard part would be to write the grib file. The Unidata decoders package reads GRIB and writes netCDF, so one would have to reverse the routine, probably not a easy task. gribtonc reads the GRIB file over a template and then it extracts the info. The gribdump routine reads the GRIB and writes the output to stdout. Probably the reverse of gribdump would be the better choice. One would have to install the decoders package for these routines. I looked on the web, there are GRIB encoding packages available, never used any so I can't comment. That's probably a better way to go instead of trying to read the ~10k lines code of gribdump. Some info about GRIB encoding, many more on the web : http://rsd-www.nrl.navy.mil/7214/data_fmt.html#grib You might want to look at the output of the eta model using gribdump, so you are aware of the format and parameters. I would appreciate hearing about your findings. I've heard of the netCDF-GRIB request a couple of times and never heard of the result. Also you might want to send your problem to decoders@xxxxxxxxxxxxxxxxx maillist. You have to join to send the message.
The decoders page has all the needed info. http://www.unidata.ucar.edu/packages/decoders Good luck, Robb... On Tue, 10 Dec 2002, Brian Etherton wrote:
Hello there Robb, My name is Brian Etherton, post-doc at the University of Miami. I am working in collaboration (COMET proposal) with the NWS to initialize the workstation ETA model using the LAPS analysis produced at NWS Miami. At present, the LAPS output is in netCDF form. The ETA model, as near as I know, is initialized using the grib 218 format. So, my task is to convert from one to the other, and to have the correct variables in the grib file (which I reckon may not be the same as the LAPS analyses, certainly, the vertical coordinate will differ). I am kind of new to this whole game, so any insights you have would be great. There seems to be lots of ways to go from grib to netCDF, but as of yet, I haven't found a way to do the reverse. My guess is that I will have to code this all up myself, which I can do if given a pretty clear road map of how to go about doing it. Thanks for any and all help, Brian Etherton
============================================================================== Robb Kambic Unidata Program Center Software Engineer III Univ. Corp for Atmospheric Research rkambic@xxxxxxxxxxxxxxxx WWW: http://www.unidata.ucar.edu/ ==============================================================================
decoders archives: