Thiessen Polygons

Summary

Generates competitive advantage trade areas for each store by creating boundary lines equidistant from each of the store locations.

Learn more about how Thiessen Polygons works

Illustration

Usage

• The spatial reference of the output feature class will be the same as the store layer.

• The store layer input feature class must be point features.

• In most cases, the store layer input feature layer will be a Business Analyst store layer.

• Selecting all sites to use will create rings for each point feature in the ring centers (stores) input feature class.

• In ArcMap, trade areas will only be created for features that are within the active study area or analysis extent.

• There must be at least two store points in the input store layer for this tool to work.

Syntax

ThiessenPolygons_ba (StoreLayer, StoreIDField, All_Or_Single_Or_Selected, OutputFeatureClass, {ByID_Or_ByName}, {Single_Site})

Parameter	Explanation	Data Type
StoreLayer	The input feature class containing center points for the Thiessen polygons. In most cases, this will be a Business Analyst store layer.	Feature Layer
StoreIDField	Unique ID field in the polygon center (store) layer.	Field
All_Or_Single_Or_Selected	Defines how to create polygons for points in the input feature layer. All —Polygons are created for all points. Single —Polygons are created for a single point. Selected —Polygons are created for all selected points in ArcMap.	String
OutputFeatureClass	The feature class that will contain the polygon features.	Feature class
ByID_Or_ByName (Optional)	Field used to select a single point. ID —Selects a single point using the store ID field. Name —Selects a single point using the store name field.	String
Single_Site (Optional)	ID or name of store to be used as the single point.	String

Code Sample

ThiessenPolygons Example (Stand-alone Script)

# Name: ThiessenPolygons.py
# Description: Creates Thiessen based trade areas around selected stores. 
# Author: Esri

# Import system modules
import arcview
import arcpy

arcpy.AddToolbox("C:\Program Files (x86)\ArcGIS\Desktop10.3\Business Analyst\ArcToolbox\Toolboxes\Business Analyst Tools.tbx")

try:
# Acquire extension license 
  arcpy.CheckOutExtension("Business") 
 
# Define input and output parameters for the Thiessen Polygons tool
  StorePath = "C:/temp/sf_stores.shp"
  IdFld = "STORE_ID"
  OutPath = "C:/temp/ThiessenPolygons.shp"
 
# Create Thiessen Polygon based trade areas
  arcpy.ThiessenPolygons_ba(StorePath, IdFld, "ALL", OutPath)
 
# Release extension license 
  arcpy.CheckInExtension("Business") 
 
except:
  print arcpy.GetMessages(2)

Environments

This tool does not use any geoprocessing environments

Licensing Information

• ArcGIS for Desktop Basic: Requires Business Analyst
• ArcGIS for Desktop Standard: Requires Business Analyst
• ArcGIS for Desktop Advanced: Requires Business Analyst

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