1) The process of depicting land lines on a map to indicate the lines' location with respect to adjacent terrain and culture, using the information shown on plats and field records of the Bureau of Land Management with evidence, on the ground, of the locations of the lines to determine the location on the map. (BLM) (2) The process of depicting land lines of the public lands on a topographic map to indicate the true, theoretical or approximate locations relative to the adjacent terrain and culture.