networkSDNCheckForLoops

Check a Single Direction Network for loops

Identifies if a Single Direction Network (SDN) has loops and creates a Polyline layer that represents the loops. The source data for the SDN should be edited and the loops corrected

Inputs:

A Single Direction Network created with ET GeoWizards (.etn file)

Outputs:

A Polyline feature layer with polylines that represent the loops.

Notes :

If the source of the Network is edited, the network should be rebuilt in order to reflect the changes made in the source.

Examples:

A typical river with an island. The flow direction in both channels is the same (from Node 1 to Node 2), so no loop is present

No Loop

The transported agent travels from node 1 to Node 2 then returns from Node 2 to Node 1 - this is a loop. The source data for the network should be corrected.

Loop present

Running Programmatically

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Parameters

Expression	Explanation
Function Name	SDNCheckForLoops
<Network to Use>	A String - the full name of the Network file (.etn).
<Output Points>	A String - the full name of the output Point layer.

Running the function

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, "SDNCheckForLoops", "Network to Use", "Output Points"])
.NET using ETGWRun.exe	StartInfo.FileName = ETGWPath StartInfo.Arguments = "SDNCheckForLoops" "Network to Use" "Output Points"
.NET using ETGWOutX.dll	SDNCheckForLoops(Network to Use,Output Points)
ArcPy	arcpy.SDNCheckForLoops(Network to Use,Output Points)

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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