GSPACE sets the grid spacing of the ETA model domain where:
GSPACE = DLHD
from the eta_run.csh script.
GSPACE is the grid spacing of the computational model domain in
degrees longitude respectively. A VERY rough conversion to km over
the central US would be:
km/150 = delta degrees
Thus from above:
10km grid spacing: GSPACE = 0.067
15km grid spacing: GSPACE = 0.098
32km grid spacing: GSPACE = 0.213
GSPACE is the same as the values for DLMD and DLHD in eta_run.csh.