Unformatted text preview: then a reclassification of the distance layer • the rate of spreading may be modified by another layer representing "friction" o e.g. the friction layer could represent varying cost of travel o this will affect the width of the buffer - narrow in areas of high friction, etc. Visible area or "viewshed" • given a layer of elevations, and one or more viewpoints, compute the area visible from at least one viewpoint o e.g. value = 1 if visible, 0 if not o useful for planning locations of unsightly facilities such as smokestacks, or surveillance facilities such as fire towers, or transmission facilities...
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- Fall '08