I'm looking to incorporate large, rolling landscapes in my current project. I came to think that having a dataset of some kilometres of country-side would be a great start. My question is two-fold:
1) Are there datasets available to the public that contain heightmap information at a resolution relevant to this application, and if not
2) Are there programs available to generate such landscapes?
Off the top of my head, a few games that have terrain that is comparable to what I'm after are WWII Online, Operation Flashpoint and T-72. I presume the data within these games is not based on real-world data, but I figured it would be a good place to start.