I want to take a topographical map of the world, reverse the altitudes, and increase the water level to cover 71%. Is there an easy way to do this? I can't tell if all the topographical maps I'm finding are accurate or if they're modified to represent the waterline.
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Uhhh sounds complicated.. maybe watch Drain the oceans on national geographic Channel.. weekly series with lots of smart scientist's and you can get some ideas??
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Usgs has some good maps. Look at the national elevation dataset(NED). I also think they have mapped most the ocean floor using low frequency radio waves from satellites. The n it's just find the volume under a plane. Seems easy. Just sum (Zplane-Zmap)*gridArea.
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I'd start with NASA's blue marble data sets, but topography is only represented for land. I believe you'll have to combine it with the bathymetry datamaps. As for the 71%, that sounds like an optimization problem. Possibly something one could throw Excel/gnumeric at.
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You'd have to make a world and simulate erosion over eons. It would be very cool. There's stuff underwater that wouldn't fit. (Like a giant waterfall under the Mediterranean, from the "Drained" television series.)