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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Taylor, I can't help thinking that the C++ library you are using seems a little more brittle than the C route at this phase in its evolution. Have you considered making calls to the C API from your C++ call? THe methods for extracting subsets of variables are quite clear in the C API... On Mar 3, 2013, at 4:34 PM, Taylor Binnington <tbinnington@xxxxxxxxx> wrote: > Hello, > > I'm attempting to read only certain parts (specific indices of specific > variable arrays), remotely, from a MERRA HDFEOS file. > > I've recently upgraded to NetCDF 4.2.1.1, using Lynton's C++ library. At > first, I was using trying to subset the data directly from an OPeNDAP URL > supplied to NcFile, but it's been suggested to me, by an earlier post in the > OPeNDAP forums, that this is not a good way to go. Instead, I should use > NetCDF API calls. > > I have carefully read through the C++ interface guide, including this example: > > http://www.unidata.ucar.edu/software/netcdf/docs/cxx4/test_var_8cpp-example.html > > but am struggling to understand how to do this. A push in the right direction > would be very appreciated. The example (I don't fully understand it, but was > trying to emulate some of the example that I linked above) > > #include <iostream> > #include <netcdf> > int main() { > NcFile > dataFile("http://goldsmr2.sci.gsfc.nasa.gov/opendap/hyrax/MERRA/MAT1NXSLV.5.2.0/1991/01/MERRA100.prod.assim.tavg1_2d_slv_Nx.19910101.hdf";, > NcFile::read); > NcGroup grouptest(dataFile.addGroup("Dataset")); > } > > gives me the error: > > terminate called after throwing an instance of 'netCDF::exceptions::NcNotNc4' > what(): NcNotNc4: Attempting netcdf-4 operation on netcdf-3 file. > file: ncGroup.cpp line:265 > Aborted > > This is not surprising, since the file is not a NetCDF-3 file. > > Thank you in advance. > Taylor > > -- > Taylor Binnington > e. tbinnington@xxxxxxxxx > > _______________________________________________ > netcdfgroup mailing list > netcdfgroup@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ -- Dr. Christopher Lynnes, NASA/GSFC, ph: 301-614-5185
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