ArcMap

Thiessen Polygons

Available with Business Analyst license.

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

Thiessen polygon example

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

arcpy.ba.ThiessenPolygons(StoreLayer, StoreIDField, All_Or_Single_Or_Selected, OutputFeatureClass, {ByID_Or_ByName}, {Single_Site})
ParameterExplanationData 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.ImportToolbox(r"C:\Program Files (x86)\ArcGIS\Desktop10.8\Business Analyst\ArcToolbox\Toolboxes\Business Analyst Tools.tbx")

# Acquire extension license 
arcpy.CheckOutExtension("Business") 
 
# Define input and output parameters for the Thiessen Polygons tool
StoreLayer = "C:/temp/sf_stores.shp"
StoreIDField = "STORE_ID"
All_Or_Single_Or_Selected = "ALL"
OutputFeatureClass = "C:/temp/ThiessenPolygons.shp"
ByID_Or_ByName = ""
Single_Site= ""
 
# Create Thiessen Polygon based trade areas
arcpy.ThiessenPolygons_ba(StoreLayer, 
						StoreIDField, 
						All_Or_Single_Or_Selected, 
						OutputFeatureClass, 
						ByID_Or_ByName,
						Single_Site)
 
# Release extension license 
arcpy.CheckInExtension("Business")

Environments

This tool does not use any geoprocessing environments.

Licensing information

  • Basic: Requires Business Analyst
  • Standard: Requires Business Analyst
  • Advanced: Requires Business Analyst

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