Hi Emily, Sorry to have taken so long to respond to your question ... > I'm using a fortran code to convert my data file to netcdf. The data values > going in to the fortran code are sensible, but the netcdf output is quite > wonky. I'm thinking it could be a big endian vs. little endian problem. Is > there an easy way to correct the netcdf file? The netCDF classic format or 64-bit offset variant always stores the data in XDR (Big Endian) form, and the library takes care of the conversions on reading or writing, so that programs using the library alsways deal with the data in native form. That's one of the purposes of the netCDF library, to insulate programmers from having to know anything about characterisitics of the computer on which the data was written. The netCDF-4 format by default stores the data in native format of the writing machine, and the library converts this to native form of the reading machine when the data is read, so again the library insulates you from differences in endian-ness, in this case with a "reader makes right" approach. If the data looks "wonky", could it be that it's packed with "scale_factor" and "add_offset" attributes, that you have to apply after reading to reverse the packing? You can see such attributes in the output of "ncdump -c" on the netCDF file. ncdump without the "-c" option should also show you the packed values, so you can verify your Fortran program is reading the same values as seen by the C library. If packing is the problem, the formulas for unpacking the data are here: http://www.unidata.ucar.edu/software/netcdf/docs/BestPractices.html#Packed Data Values If you're still having problems, try compiling and linking one of the example Fortran programs to see if those work OK with your netCDF library: http://www.unidata.ucar.edu/software/netcdf/examples/programs/index.html --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: OKU-828902 Department: Support netCDF Priority: High Status: Closed
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