1. A computer implemented digital image processing method that generates a visual depiction of the probabilities of detecting terrestrial targets from an observation aircraft comprising the steps of: receiving and storing input data defining an observation aircraft route relative to a geographical area with lines of communications; receiving and storing input data defining first and second parameters where the first parameters are associated with the ability of a sensor carried by the observation aircraft to detect targets in the geographical area and the second parameters are associated with attributes related to the capability of targets to be detected; determining for segments of the lines of communication a visibility percentage for which the segments will have line-of-sight visibility from the observation aircraft during the travel of the latter over its entire route; determining for the segments having a visibility percentage above a first set value a probability percentage that the sensor would detect a terrestrial target on the segment during the route traveled by the observation aircraft based on the first and second parameters; generating a map of the geographical area with color-coded segments identifying segments for which the sensor has a probability percentage above a second set value of detecting the terrestrial target by a first color, thus enhancing the ability to quickly and easily discern target detection probabilities for the segments of the lines of communication for a selectable set of conditions.