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There is a critical need to locate trails and other optical gaps in forested terrain for locating optimal paths and for planning troop movement, locating sites for optimal ground-tosky RF communications, and mapping areas of likely detection from overhead sensors. Airborne Laser Swath Mapping (ALSM) data are segmented based on canopy density. Candidate foliage voids are seeded and then visibility vectors between seeds are used to identify optical lines of sight over the terrain. Geometric constraints are used to remove false trails, until only the most probable trails remain.

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