A digital contour map is used for terrain representation of Computer Generated Forces(CGF) in Distributed Interactive Simulation(DIS).The method of contourline terrain representation and reasoning is presented.After discussing the determination of terrain and intervisibility,and etc.,it is shown that this approach is practical and it's reasoning is simple.This approach has an advantage in easily acquiring and editing the map data.This CGF contourline terrain representation and reasoning is better than the polyonal,especially in the simulation of navy or air combat in wide range.
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