createCenterlines

Create Centerlines

Creates centerlines from polygon features.

A polygon feature class.
Maximum Width.
Minimum Width.
Centerline type
- Inside - the centerlines will be created inside the polygons - suitable for deriving centerlines from rivers and streets represented by polygons
- Outside - the centerlines will be created in the gaps between polygons - suitable for deriving street centerlines from cadastral data.
Create separate centerline for each polygon option.

If the "Inside" option is used, the input polygons should represent linear by nature features (rivers, roads, etc.)
If the "Outside" option is used, the gaps between the input polygons should represent linear by nature features (streets, etc.)
The new feature class will not have any attributes.
Maximum and Minimum widths should be specified in the units of the spatial reference of the input feature class
Use reasonable for your data Maximum and Minimum widths.
The results might contain some unwanted lines. Inspect the results and remove undesired features.
Use the Smooth Polylines function after inspecting the results.
If executed from Python, Command line or ArcGIS Toolbox and want to create separate centerline for each polygon option, use the Create Centerlines Single function.

Input Dataset

Result

Centerlines Inside Polygons

Result (Detail

Input Dataset

Result

Centerlines Outside Polygons

Result (Detail)

Input and Result if the create separate centerline for each polygon option / Create Centerlines Single is used.

Parameters

Expression	Explanation
Function Name	CreateCenterlines
<input dataset>	A String representing the input layer. Must be of Polygon type.
<output dataset>	A String - the full name of the output layer.
<location option>	A String indicating the location of the centerlines to be created. "in" - centerlines inside the input polygons (rivers, streets, etc.) - "out" - centerlines outside the input polygons (cadastre, etc.)
<Max Width>	A Double representing the maximum width of the polygons (in the units of the spatial reference of the input dataset.
<Min Width<	A Double representing the minimum width of the polygons (in the units of the spatial reference of the input dataset.

ETGWPath used in the table below is the full path to ETGWRun.exe (E.G. "C:\Program Files\ETSpatial Techniques\ETGeo Wizards\ETGWRun.exe")

Language	Syntax
Python	subprocess.call([ETGWPath, "CreateCenterlines", "input dataset", "output dataset", "location option" "Max Width", "Min Width"])
.NET using ETGWRun.exe	StartInfo.FileName = ETGWPath StartInfo.Arguments = "CreateCenterlines" "input dataset" "output dataset" "location option" "Max Width" "Min Width"
.NET using ETGWOutX.dll	CreateCenterlines(input dataset, output dataset, location option, Max Width, Min Width)
ArcPy	arcpy.CreateCenterlines(input dataset, output dataset, location option, "Max Width", "Min Width")

Parameters

Expression	Explanation
Function Name	CreateCenterlinesSingle
<input dataset>	A String representing the input layer. Must be of Polygon type.
<output dataset>	A String - the full name of the output layer.
<Max Width>	A Double representing the maximum width of the polygons (in the units of the spatial reference of the input dataset.
<Min Width<	A Double representing the minimum width of the polygons (in the units of the spatial reference of the input dataset.

ETGWPath used in the table below is the full path to ETGWRun.exe (E.G. "C:\Program Files\ETSpatial Techniques\ETGeo Wizards\ETGWRun.exe")

Language	Syntax
Python	subprocess.call([ETGWPath, "CreateCenterlinesSingle", "input dataset", "output dataset", "Max Width", "Min Width"])
.NET using ETGWRun.exe	StartInfo.FileName = ETGWPath StartInfo.Arguments = "CreateCenterlinesSingle" "input dataset" "output dataset" "Max Width" "Min Width"
.NET using ETGWOutX.dll	CreateCenterlinesSingle(input dataset, output dataset, Max Width, Min Width)
ArcPy	arcpy.CreateCenterlinesSingle(input dataset, output dataset, "Max Width", "Min Width")

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.