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
>
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--
Dr. Christopher Lynnes, NASA/GSFC, ph: 301-614-5185
