You can find topos encoded as GeoTIFFs, which could be loaded. That would work pretty well.
I haven't added support for mesh surfaces yet, which would be the real way to do it. Importing the data wouldn't be too hard, but there would be some fairly major interface issues I need to work out first to make it useful. Rendering a 3d surface in Google Maps isn't really going to work, so I need to define what analysis tools would be needed. Drawing contours at specific elevations is one of them, and that is really what you'd want for checking where the coastline will be in 50 years.
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I haven't added support for mesh surfaces yet, which would be the real way to do it. Importing the data wouldn't be too hard, but there would be some fairly major interface issues I need to work out first to make it useful. Rendering a 3d surface in Google Maps isn't really going to work, so I need to define what analysis tools would be needed. Drawing contours at specific elevations is one of them, and that is really what you'd want for checking where the coastline will be in 50 years.