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Viewshed analysis is a spatial analytical technique used to determine the areas that are visible or not visible from a specific observation point or set of points within a landscape. It is primarily based on digital elevation models and is widely applied in geography, GIS, urban planning, environmental studies, defense, telecommunications, and landscape management. The fundamental objective of viewshed analysis is to assess line-of-sight relationships by identifying which locations can be seen from an observer and which are obstructed by terrain or other surface features. The output is usually a ____ _________ ___ ______ _________ _____ ____ ___ ________ ________ ______ _________.
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