1. A method for determining whether a target of interest located within radar resolution cells in a target area of interest is detectable with a radar system from a location and elevation of said radar system, comprising: (a) developing a topographic map of the terrain in said target area of interest; (b) mapping said radar resolution cells onto said topographic map; (c) modeling radar signal propagation to each of said radar resolution cells on said topographic map; and (d) determining, using the results of said modeling, if said radar system has sufficient signal-to-noise (SNR) to detect said target of interest.