Polygons whose boundaries define the area that is closest to each point relative to all other points. Thiessen polygons are generated from a set of points.
Thiessen or voronoi polygons define individual areas of influence around each of a set of points. s are polygons whose boundaries define the area that is closest to each point relative to all other points.
Thiessen polygon creator: Automatically create thiessen polygons around your model nodes to support demand assignment (LoadBuilder) methods that require service polygons.
DATA MANAGEMENT ...
Polygons generated from a set of sample points. Each defines an area of influence around its sample point, so that any location inside the polygon is closer to that point than any of the other sample points.
The Thiessen polygon map generated from these data appeared somewhat blocky, but revealed the major spatial patterns of vegetation distribution (Fig. 3). Wetlands growing in the bed of the Pokegama River were dominated by the Spar covertype.
See Also: s
[data structures] The division of a two-dimensional area into polygonal tiles, or a three-dimensional area into polyhedral blocks, in such a way that no figures overlap and there are no gaps.
10 A Vector Surface Created Using Thiessen Polygons
While the creation of Thiessen polygons results in a polygon layer whereby each polygon, or raster zone, maintains a single value, ...
s are formed by assigning the value of the nearest sample point to each spatial unit resulting in a map of the perpendicular bisectors between neighboring sample points.
By setting npoints=1, the module can be used to calculate raster Voronoi diagrams (Thiessen polygons).
The bubbles divide the counties into "nearest-neighbor" polygons, also known as polygons of influence, s, Voronoi polygons, and Dirichlet cells.
See also: Polygon, Analysis, Model, GIS, Location