#!/bin/sh
# Calculate the gradient and intensity grids for 
# color shaded relief image of Long Island Sound 
# 3 arc second topography grid

grdgradient li.grd -A315 -Gli_grad.grd -N -M -V
grdhisteq li_grad.grd -Gli_grad_eq.grd -V -N
grdmath li_grad_eq.grd 3.0 / = li_intens.grd