Thiessen polygons [CARTOGRAPHY]-A set of connected polygons, each surrounding a single point such that the entire area enclosed within a polygon is closer to that point than any other. The edges of the polygons are the perpendicular bisectors of lines connecting the points. Also referred to as “Voronoi diagram” or “Dirchet tessellation.”

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Source: NSPS “Definitions of Surveying and Related Terms“, used with permission.

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