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I've been playing around with styrofoam making boat hull mock-ups and I have a few words to say about it.
Styrofoam is a very unforgiving substance; if you do not mould it well, you can very easily mess it up. But since this is for creating land, don't worry about crunching it once or twice. To finely slice styrofoam with a blade thicker than 2mm, you must start your cut within 1cm of the edge of the foam, otherwise it will crack. I used the long blade of a Swiss army knife (7cm or so) because it is pretty thin. With a really thin blade (xacto thinness) you can start from wherever and cut to wherever. You must perform a sawing action and cut totally through the foam for a clean cut.
For a rough cut, you can just dig out cavities with the tip of the knife, and you can smooth the bumpiness with a clothes iron. It should be pretty hot (100C or so) and make sure you ventilate your area because it smells really bad. Terrible actually.
For a large flat area with lots of bumps, scrape the surface very hard as to dig up every other styrofoamie bubble.
I might think of something else later...
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