type=continuous signed=yes projection=regular_ll dx=0.03125 dy=0.03125 known_x = 1. known_y = 1. known_lat = -90. known_lon = -180. wordsize=2 tile_x=5760 tile_y=5760 tile_z=1 tile_bdr=0 units="meters" description="SHARAD paleotopography"