Using the ArcGIS Spatial Analyst toolbar to calculate Euclidean allocation
Release 9.3 Last modified January 13, 2012

About calculating Euclidean allocation

Note: This topic was updated for 9.3.1.

By calculating the straight line (Euclidean) allocation, you allocate cells to the closest source. The source can be anything you choose, such as a point dataset displaying the location of parks and can be in any supported raster or feature format.
Learn more about calculating Euclidean allocation
Learn how to calculate Euclidean allocation using the Euclidean Allocation tool
Learn about other Spatial Analyst toolbar functions

How to calculate Euclidean allocation

1. Click the Spatial Analyst dropdown arrow, point to Distance, and click Allocation.
   
2. Click the Assign to dropdown arrow and click the layer containing sources to which you want to assign cells.
   
3. Optionally, specify a maximum distance.
   
Cells outside this distance will not be considered in the calculation and will be given the value of NoData.
Leaving the value for the Maximum distance parameter blank will not put a limit on how far distances will be measured.

4. Specify an output cell size for the result.
   
The default cell size is specified in the Options dialog box.

5. Type a name for the result, or leave the default to create a temporary result in your working directory.
   
6. Click OK.
   

Tips

On the Tools toolbar, use the Measure tool to decide what the maximum distance from each source should be. On the Spatial Analyst toolbar, click Options to set the working directory, extent, and cell size for your analysis results. If the file you need is not in your table of contents or if you need to check the directory to place your results, click the Browse button.

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