Isn't it the normal heightmap stuff from isometric view they do ? I'm not sure about it. But if it is, you have a bitmap with every color value is one height. For example, you use a monochrom bitmap, value 0 (black) is the lowest point and value 255 (white) is the highest point. So you get the landscape working, but the problem is, that it looks really ugly without any texture on it.

So you need displacement mapping, which is really slow in software. You can find an article on heightmaps on www.xgames3d.com

There must be some other ones, but I don't know where to find them.

CU

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Skullpture Entertainment
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