> Hi Russ, > > Thanks for your quick response. I am using ncdump, > HDF Version 4.2 Release 6, June 14, 2011. OK, that's not Unidata software, it was written by HDF developers a long time ago to test a netCDF version 2 API for HDF4 data. It can't read netCDF-3 or netCDF-4 data, as far as I know, but only HDF4 data that was written with the HDF4 API for the netCDF version 2 library. Maybe Unidata's netCDF-3 or netCDF-4 software has been installed somewhere else on Janus, with a version of ncdump intended for reading netCDF files. By the way, the ncdump in our current release (netcdf-22.214.171.124) can read some HDF4 and HDF5 files through the netCDF-3 API, if it's built with the right configure flags (--enable-hdf4) ... If you can't find an existing installation, I recommend building and installing from source, using the latest and greatest release candidate: http://www.unidata.ucar.edu/downloads/netcdf/netcdf-rc/index.jsp or the current operational release http://www.unidata.ucar.edu/downloads/netcdf/netcdf-4_2_1_1/index.jsp following the instructions here: http://www.unidata.ucar.edu/software/netcdf/docs/building.html --Russ > I am trying to use ncdump on the Janus supercomputer > at CU, which runs Redhat 5.5 Enterprise. > > The name of the file is > wrfout_d01_2000-01-24_12:00:00. I do not get an > error message when running cat > wrfout_d01_2000-01-24_12:00:00. It's 38 MB, so I > don't think I can send it as an email attachment, > unfortunately. Thank you for not attaching that 38GB file! I've been dealing with netCDF files that size lately, and they qualify as BigData on my desktop machine ... --Russ > ---- Original message ---- > > Date: Fri, 05 Apr 2013 13:41:46 -0600 > From: "Unidata netCDF Support" > <address@hidden> > Subject: [netCDF #OWN-203547]: Problem with ncdump > To: address@hidden > Cc: address@hidden > >Hi Matt, > > > >> I'm trying to use ncdump to read a WRF output > file, > >> but am getting the following error: "***ncdump: > >> ncopen failed on <file name>". I'm not sure > what the > >> problem is since I can use ncdump to open > sample > >> netCDF files that I download from UCAR's > website. > >> Any idea what's up? > > > >I need more information about the problem. > > > >What version of ncdump? Look at the last line of > output > >from running ncdump --version. If there is no > version listed, > >it's a very old and unsupported ncdump, so you > may need to > >upgrade. > > > >What platform are you running ncdump on? If it's > an old version > >of Windows, the port you have may have been > created by a third > >party before we started officially supporting > building the > >netCDF library and utilities from source on > Windows. We also > >now support binary downloads of netCDF for > Windows. > > > >Can you run a different program than ncdump on > the same file > >from the same directory? For example, do you get > an error message > >from running "cat <file name>" ? > > > >Can you make the WRF output file available? > > > >--Russ > > > >Russ Rew UCAR Unidata Program > >address@hidden http://www.unidata.ucar.edu > > > > > > > >Ticket Details > >=================== > >Ticket ID: OWN-203547 > >Department: Support netCDF > >Priority: Normal > >Status: Closed > > > > Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: OWN-203547 Department: Support netCDF Priority: Normal Status: Closed
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