haeriphos

Hello, About to pick up Emergency 20 and I'm interested in creating a new map at some point. I see a lot of posts regarding modeling new vehicles, sounds, etc but nothing on creating a new map. I see the game comes with a level editor but how is the functionality for creating a brand new terrain space? Would I have to model all the terrain by hand using the editor tools, or is there a way to import something such as a height map into the editor? If there are any resources for this I'd appreciate being pointed in the right direction. Thanks!