networkClassifyStreams

Classify Streams

Analyzes a Single Direction Network (SDN) representing streams and assigns order to each edge using 2 different ordering methods.

Strahler: Assigns an order to each stream segment according to the system proposed by Strahler (1952). The order of the stream edge starting at the stream source is assigned an order of 1. The order increases by 1 only when two edges of the same order intersect. For example if two edges of order 1 intersect, the following edge will be assigned an order of 2. When two edges of different order intersect, the following edge preserves the higher order..
Shreve: Assigns an order to each stream segment according to the system proposed by Shreve (1967). The order of the stream edge starting at the stream source is assigned an order of 1. When two edges intersect the following edge is assigned the sum of their orders. For example if two edges of order 1 and order 2 respectively intersect, the following edge will be assigned an order of 3.

A Polyline feature layer with classified streams. Two fields are added to the attribute table

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

Streams classified using Strahler method

Streams classified using Shreve method.

Parameters

Expression	Explanation
Function Name	SDNClassifyStreams
<Network to Use>	A String - the full name of the Network file (.etn).
<Output Classified Streams>	A String - the full name of the output Polyline layer.
<Classification Method>	A String indicating the method to be used. Valid Values: "Strahler" or "Shreve"

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, "SDNClassifyStreams", "Network to Use", "Output Classified Streams", "Classification Method"])
.NET using ETGWRun.exe	StartInfo.FileName = ETGWPath StartInfo.Arguments = "SDNClassifyStreams" "Network to Use" "Output Classified Streams" "Classification Method"
.NET using ETGWOutX.dll	SDNClassifyStreams(Network to Use,Output Classified Streams,Classification Method)
ArcPy	arcpy.SDNClassifyStreams(Network to Use,Output Classified Streams,Classification Method)

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.