viewshed
n.— «She sows her speech with buzzwords of the movement—viewsheds, easements and takings.» —“The Coast’s own Lorax” by M. Keller in Ocean Springs Sun Herald (Biloxi, Miss.) Mar. 19, 2006. (source: Double-Tongued Dictionary)
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viewshed background site
http://www.phys.ufl.edu/docs/matlab/toolbox/map/viewshed.html