What is the range of the depth of the oceans??? Is 3-5km reasonable?
You might wish to look at http://www.ngdc.noaa.gov/mgg/global/seltopo.html,
from which you can get topography information for any region of the globe,
measured on a 5-minute grid and available in either ASCII or binary. Even
if you don't want the numbers, there's a nice picture (although they forgot
to put a depth/height scale on the picture.
--
--James McLean
jmclean@chem.ucsd.edu
post doc
UCSD