make_sso

routine to compute subfgrid scale orography parameters
from a spherical harmonics method

Requirements:
- SPHEREPACK library
- FFTW ?
- ifortran
- netcdf

Options:
-i input_relief_file
-res nlon nlat : of the output grid  
-v : orography variable name of input file
-m : option

Example to compile then run make_sso from a high-resolution Relief.nc file to
a 180x90 horizontal grid. 

./compile
file=Relief.nc
./make_sso.e -i $file -res 180 91 -v z

Output file is ${file}_180x91