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Create Thiessen Polygons (Analysis) (ArcInfo only)

Release 9.3
Last modified January 11, 2011
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NOTE: This topic was updated for 9.3.1.


This converts input points to an output feature class of Thiessen proximal polygons.

Thiessen polygons have the unique property that each polygon contains only one input point, and any location within a polygon is closer to its associated point than to the point of any other polygon.


Illustration


Thiessen illustration

Usage tips

Command line syntax
An overview of the Command Line window
CreateThiessenPolygons_analysis <in_features> <out_feature_class> {ONLY_FID | ALL}

Parameter Explanation Data Type
<in_features>

The points for which the Thiessen polygons will be generated.

Feature Layer
<out_feature_class>

The polygon feature class that will contain the Thiessen features.

Feature Class
{ONLY_FID | ALL}

Determines which attributes from the Input Features will be transferred to the Output Feature Class.

  • ONLY_FID — Only the FID field from the Input Features will be transferred to the Output Feature Class. This is the default.
  • ALL — All the attributes from the Input Features will be transferred to the Output Feature Class.

String
Data types for geoprocessing tool parameters


Command line example

createthiessenpolygons c:\basedata\wells.shp c:\analysis\thiessen_wells.shp ALL

Scripting syntax
About getting started with writing geoprocessing scripts
CreateThiessenPolygons_analysis (in_features, out_feature_class, fields_to_copy)

Parameter Explanation Data Type
in_features (Required)

The points for which the Thiessen polygons will be generated.

Feature Layer
out_feature_class (Required)

The polygon feature class that will contain the Thiessen features.

Feature Class
fields_to_copy (Optional)

Determines which attributes from the Input Features will be transferred to the Output Feature Class.

  • ONLY_FID — Only the FID field from the Input Features will be transferred to the Output Feature Class. This is the default.
  • ALL — All the attributes from the Input Features will be transferred to the Output Feature Class.

String

Data types for geoprocessing tool parameters


Script example

import arcgisscripting
gp = arcgisscripting.create()

gp.workspace = "c:/basedata"
gp.toolbox = "analysis"

gp.createthiessenpolygons("wells.shp", "thiessen_wells.shp", "ONLY_FID")

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