If you want to save file size, then HDF-EOS Grid may be a way to go. If you choose to use HDF5, don't forget to use compression.
Kent On Mon, May 13, 2013 at 12:06 PM, Garrett Campbell < [email protected]> wrote: > Thanks, > I have used lat/lon for satellite images where the data is not on a > regular grid. > I was trying to save file size by not dumping out all the lat/lon float > values. > I'll look at the examples. > Garrett Campbell > > On 5/12/2013 9:51 PM, Kent Yang wrote: > > If you can use HDF-EOS, you can check > http://newsroom.gsfc.nasa.gov/sdptoolkit/userguide.html > HDF-EOS Library User's Guide Volume 1: Overview and > Examples<http://newsroom.gsfc.nasa.gov/sdptoolkit/docs/HDF-EOS_UG.pdf>for > HDF-EOS2 > HDF-EOS Interface Based on HDF5, Volume 1: Overview and > Examples<http://newsroom.gsfc.nasa.gov/sdptoolkit/docs/HDF-EOS5_UG.pdf>for > HDF-EOS5 > > HDF-EOS can assure the geographic projection is specified without > providing lat/lon values. > > If you prefer to use HDF5 or netCDF-4, you definitely need to provide > latitude and longitude values, > An attribute called units="degrees_east" for longitude and > units="degrees_north" for latitude should be specified to assure the CF > compliant. > > check http://www.hdfgroup.org/HDF5/faq/cfattributes.html > You may find HDF5, netCDF4 and HDF-EOS5 examples that may be similar to > what you want to achieve. > > Some HDF5 examples can also be found under > http://www.hdfgroup.org/ftp/HDF5/examples/ > > > Kent > > > On Sun, May 12, 2013 at 11:30 PM, Garrett Campbell < > [email protected]> wrote: > >> I have data in a simple projection: cylindrical equidistant. >> I would like to write something into the hdf file to specify the >> projection. >> Any idea what to specify? >> Any examples? >> Thanks >> >> -- >> G. Garrett Campbell >> NSIDC >> 303 492 5194 >> >> >> _______________________________________________ >> Hdf-forum is for HDF software users discussion. >> [email protected] >> http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org >> > > > > -- > Kent Yang The HDF Group > 1800 So. Oak St., Suite 203, Champaign, IL 61820 > 217.531.6107 > http://hdfgroup.org http://hdfeos.org > > > _______________________________________________ > Hdf-forum is for HDF software users > [email protected]http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org > > > -- > G. Garrett Campbell > NSIDC303 492 5194 > > > _______________________________________________ > Hdf-forum is for HDF software users discussion. > [email protected] > http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org > > -- Kent Yang The HDF Group 1800 So. Oak St., Suite 203, Champaign, IL 61820 217.531.6107 http://hdfgroup.org http://hdfeos.org
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