ETG_VoronoiAllocation

Euclidean Allocation / Voronoi Diagram / Thiessen Polygons

Derives the catchment areas of the input features (Sources). Each cell of the output raster will have the value of the closest (based on straight line distance) Source.

Inputs:

Input point, polyline or polygon feature dataset
Output raster name and format
The cell size of the output raster.
Source ID field. The values from this field will be allocated to the cells of the output raster.

Outputs:

An integer raster. Each cell will have as a value the ID of the closest input point (Source). The extent of the output is equal to the extent of the input feature class.

Example:

Notes:

For file based rasters initially the name of the output raster define the raster format:
- .img extension (for example raster1.img) - ERDAS IMAGINE image.
- .tif extension (for example raster1.tif - image.
- The initial output raster format can be changed by selecting the desired output in the dialog.

Running Programmatically

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Parameters

Expression	Explanation
Function Name	EucledeanAllocation
<InputFeatures>	A String - the full path to the input feature dataset.
<output raster>	A String - the full name of the output raster.
<CellSize>	A Double representing the cell size of the output raster.
<IDField>	A String representing the name of the field in the input point feature class to be used as point ID.

Running the function

ETSPath used in the table below is the full path to ETSRun.exe (E.G. "C:\Program Files\ETSpatial Techniques\ETSurface\ETSRun.exe")

CellSize

Language	Syntax
Python	subprocess.call([ETSPath, "EucledeanAllocation", "InputFeatures", "output raster", "CellSize", "IDField"])
.NET using ETSRun.exe	StartInfo.FileName = ETSPath StartInfo.Arguments = "EucledeanAllocation" "InputFeatures" "output raster" "CellSize" "IDField"
.NET using ETSOutX.dll	EucledeanAllocation(InputFeatures, output raster, CellSize, IDField)
ArcPy	arcpy.EucledeanAllocation("InputFeatures", "output raster", "CellSize", "IDField")

Notes:

<> - required parameter
{} - optional parameter
See examples for Python , .NET or ArcPy
The argument separator for StartInfo.Arguments is space. If a string might contain a space, you need to double quote it.

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