> 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-220.127.116.11) 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
NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly 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.