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The forest road network,which has arranged the path through the forested area appropriately, is required for the suitable management of the forest resources to raise the productivity of the forestry.Especially the efficiency of the tree logging work using the forwarder is related to the connectivity of the strip road between the logging area and the main forest network.Therefore,appropriate designing of strip road is one of the important factors for considering the break-even point of the commercial forestry management. Generally,designing of strip road is carried out in following manners.1)With reference to topographic maps, forest planning maps,aerial photos,etc.,domains to be avoided in route locations,such as a steep slope and a danger zone,is classified.2) Basic alignment of strip road that includes starting point,terminal point,and some major node points is drafted on a map.3) Basic alignment is actually field surveyed for the final decision.In previous study,the method of designing the forest road network automatically adapting graph theory has been studied. Under consideration of previous study, it is thought possible to examine the way to determine automatically basic alignment of strip road. This research shall be examined on automatically designing of strip road using graph theory and DEM measured by airborne LiDAR.Especially the relation of the alignment of the strip road and the edge direction composed the network of graph theory is considered.

Study on automatically designing of strip road alignment using airborne LiDAR data and graph theory