Most of these maps on the web are described in terms of longitude and latitude, radians or degrees/hours/minutes/seconds. But trying to do other areas in the world like Europe etc is a bit more difficult. It's easy to get grayscale maps for the United States ( from here), and I've made a Burbank region (it's pretty damn small - View image here: - ) and a Los Angeles region. Check out this or that or my favorite for info on doing it. So Simcity 4 lets you create a brand new region (group of related cities) out of most any grayscale image.
