Viewshed
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A viewshed is an area of land, water, and other environmental elements that is visible from a fixed vantage point. The term is used widely in such areas as urban planning, archaeology, and military science. In urban planning, for example, viewsheds tend to be areas of particular scenic or historic value that are deemed worthy of preservation against development or other change. The preservation of viewsheds is a goal in the designation of open space areas, green belts, and community separators.
In digital imaging, a viewshed is a binary raster indicating the visibility of a viewpoint for an area of interest. A pixel with a value of 1 indicates that the viewpoint is visible from that pixel, while a value of 0 indicates that the viewpoint is not visible from the pixel.
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