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An approach to reduce visibility index computation time and measure the associated uncertainty in terrain visibility analyses is presented. It is demonstrated that the visibility index computation time in mountainous terrain can be reduced substantially, without any significant information loss, if the line of sight from each observer on the terrain is drawn only to the fundamental topographic features, i.e., peaks, pits, passes, ridges, and channels. However, the selected sampling of targets results in an underestimation of the visibility index of each observer. Two simple methods based on iterative comparisons between the real visibility indices and the estimated visibility indices have been proposed for a preliminary assessment of this uncertainty. The method has been demonstrated for gridded digital elevation models.

Fast Approximation of Visibility Dominance Using Topographic Features as Targets and the Associated Uncertainty