This program reads USGS 30-sec terrain dataset from NetCDF file and bins it to an approximately 
3km cubed-sphere grid and outputs the data in netCDF format.

Input files needed:

1. USGS raw data in netCDF format: usgs-rawdata.nc (must be placed in same dirctory as the executables)
   Generated with software in gen_netCDF_from_USGS/ directory

   File may be found at:

   $CESMDATA/inputdata/atm/cam/gtopo30data/usgs-rawdata.nc

Output file:

USGS-topo-cube.nc
