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AN ALGORITHM FOR COMPUTING VIEWSHEDS BASED ON REFERENCE PLANES

WU Yanlan (School of Resource and Environment Science, Wuhan University, Wuhan 430079, China)  
Compared with traditional sightline based algorithms, the algorithm for computing viewsheds based on reference planes has no use for DEM interpolations, without redundance calculations. The time for computing a viewshed has nothing to do with the location of the viewpoint and the area of the viewshed, and it is slightly influenced by the area of DEMs.
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