proj:       3
zone:       0
north:      90N
south:      90S
east:       180E
west:       180W
cols:       360
rows:       180
e-w resol:  1
n-s resol:  1
top:        1
bottom:     0
cols3:      360
rows3:      180
depths:     1
e-w resol3: 1
n-s resol3: 1
t-b resol:  1
