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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Chris Meek <address@hidden> writes: > Thanks Ed - I think I have found the problem - there are > at least 3 versions of ncdump floating around on the web. > I was using the 57K + netcdf.dll version ... which produced > the #UNB. If I use the 185K version with CYGWIN1.DLL > I get NaN - which is still a problem but at least I know > what it means. And also with this latter version I get the > correct # altitudes per event, while before I was (unknown > to me until I tripped on the #UNB) getting more than the header- > specified # altitudes - but not reading them all, and even worse > maybe some mismatches between various parameter ascii dumps. > > There is a further version which is 560K and goes with SZLIBDLL.DLL > ( I can't find the latter for download one the web although it is > mentioned in many places). Hmm. I really don't know what to say about this. Incidentally, are you also using netCDF from Fortran on this platform? Or you are only using ncdump and the C library? > > So I still don't know if I am getting the correct data > (and may never know) ... but so far, except for the NaN, > it seems to fit the header parameters anyway, and it's easy > to edit out the NaN. > > > (This is the problem with black box data and programs .. I much > prefer straight binary with a text file description) > Well there I can help you. The netCDF format is just a straight binary format. After the header, which contains all the metadata, the rest of the data is laid out in the file in a very straightforward way, just as you would expect. To calculate the offsets you need, see this: http://www.unidata.ucar.edu/software/netcdf/docs/netcdf/File-Format-Specification.html The data in a netCDF file are stored in XDR format. More information can be found here: http://www.unidata.ucar.edu/software/netcdf/docs/netcdf.html#Format Ed -- Ed Hartnett -- address@hidden