Create Thiessen Polygon in ArcMap |Thiessen polygon method in GIS | Voronoi diagram in GIS
Автор: GIS & RS Oplossing in Bengali
Загружено: 2023-04-10
Просмотров: 658
Описание:
Thiessen Polygons Are Generated From A Set Of Sample Points Such That Each Polygon 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.
Thiessen Polygons (Also Called Voronoi Diagrams) Can Be Used To Show Catchment Areas For A Group Of Facilities.
The Thiessen Polygon Is A Commonly Used Methodology For Computing The Mean Areal Precipitation For A Catchment From Rain Gauge Observations Which Was Presented By A.H. Thiessen (1911). The Thiessen Method Is Based On The Assumption That Measured Amounts At Any Station Can Be Applied Halfway To The Next Station In Any Direction, Which Means That For Any Point Rainfall Is Equal To The Observed Rainfall At The Closest Gauge. The Weights Of The Rain Gauges Are Computed By Their Relative Areas, Which Are Estimated With The Thiessen Polygon Network. The Polygons Are Formed By The Perpendicular Bisectors Of The Lines Joining Nearby Stations. The Area Of Each Polygon Is Used To Weight The Rainfall Amount Of The Station In The Center Of The Polygon. If The Amount For Any Station Is Missing, The Polygon Must Be Changed. The Thiessen Method Is Unable To Consider Orographic Differences In Rainfall Distributions.
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