There are a hundred different ways to create terrain in Maya and by using a simple black and white image you can create physically accurate terrain from a DEM (digital elevation model) in a matter of seconds. You can find DEM models (images) from a variety of sources on the internet that will allow you to create real world terrain for any scene you desire. This tutorial by Stuart Christensen will show you how to use DEM info to make a physically accurate, real world terrain for any scene....Enjoy!