Question
What is viewshed analysis? Discuss different methods of viewshed analysis. Add a note on the factors influencing viewshed analysis.
Answer :
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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 binary or continuous surface indicating visible and non-visible zones, helping in understanding visual exposure, surveillance coverage, and visual impact. One of the most common methods of viewshed analysis is the line-of-sight method. In this approach, straight lines are drawn from the
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