Ok,
I can't find DTED for the Marianas, so I'm looking for the next best thing. Luckily, the islands are small if I need to do it manually, but...
I've got some relief maps of the islands, including some USGS topo maps and I was wondering if I make a grey scale of the islands, what variation in color values I should use for each elevation gradient. I'm guessing that after I make the grey scale, I just use a blur to smoothe the transitions.