Query about Terrain Generation

A few friends and I are planning to make a RTS game in Java using Xith3D. I am quite an experienced Java programmer but am relatively new to Xith3D. I am trying to gauge what is feasible in Xith3D and am trying to find information about Terrain Generation (something like a tutorial) but all I can find is the terrain example on the demos page of the xith.org website.

Could anyone please point me in the right direction or give me any information about how I generate terrain for this style of game.
Thanks

depends on what kind of rts? u mean
like citys or more landscapes?

Well from our current design the game will be similar to Age of the Empires / Settlers (3/4) So a god like game where you build your empire up from the resources on the map. My question is relating more to how I go about making the basic map. I plan to import buildings and character from 3D modelling tools but its the terrain which is causing me the problems.

http://www.gameprogrammer.com/fractal.html

Thanks for the link, am just reading up about. Hoping once I understand the theory I can start applying this to the terrain template in Xith.