Clean Pseudo Nodes

Combines polylines, which share a pseudo node, based on user specified attributes. The resulting polyline data set does not contain multi-part polylines. The topology of the data set is preserved. The attribute update rules include range values update

Inputs

A polyline feature layer
Fields to be used for dissolving
Update rules for the rest of the fields to be transferred

Outputs:

An aggregated polyline feature class
Only the polylines which share a pseudo node that have the same values for the dissolve fields will be aggregated
No multi-part polylines will be created.
The attributes will be transferred according the user specified rules. For the fields with no specified update rule, date and blob fields, the aggregated feature will carry the attributes of the first feature.

Notes:

The Clean Pseudo Nodes function is similar to Dissolve but has several advantages:
- Multiple dissolve fields can be used
- Only the polylines which share a pseudo node that have the same values for the dissolve fields will be aggregated
- It preserves the topology of the polyline layer - no regular node will be removed as a result of the procedure. See example
- The attribute update rules include rules to handle single and address ranges. See example
It is recommended the Explode function to be used before dissolve in order to ensure proper distribution of the attribute values of the numeric fields.
If no dissolve field is selected, all the pseudo nodes will be removed without considering the attribute values.
Range attributes from numeric fields can be handled. The records that have range values containing non numeric characters will be copied arbitrary to the resulting features.

Example:

Input Layer. Dissolve field = "Streetname"

before unsplit

Attribute Table

attribute table before clean pseudo

After Clean Pseudo Nodes. Update rules

"L_F_ADD" - Address Range - Paired field - "L_T_ADD"

"R_F_ADD - Address Range - Paired field "R_T_ADD"

after clean pseudo nodes

updated address ranges

Running Programmatically

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Parameters

Expression	Explanation
Function Name	CleanPseudoNodes
<input dataset>	A String representing the input layer. Must be of Polyline type.
<output dataset>	A String - the full name of the output layer.
{Dissolve Fields}	A String representing a list (separated with ";") with the field names to be used for dissolving.
{Update Rules}	A String representing a list (separated with ";") with the field names and update rules. Valid rules are: "FIRST", "LAST", "MIN", "MAXLENGTH", "MAX", "SUM", "RANGECONTINUOUS", "RANGEADDRESS" depending on the field type. Example: "Field1 RangeAddress Field2;Field3 First;Field3 MaxLength"

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, "CleanPseudoNodes", "input dataset", "output dataset", "Dissolve Fields", "Update Rules"])
.NET using ETGWRun.exe	StartInfo.FileName = ETGWPath StartInfo.Arguments = "CleanPseudoNodes" "input dataset" "output dataset" "Dissolve Fields" "Update Rules"
.NET using ETGWOutX.dll	CleanPseudoNodes(input dataset, output dataset, Dissolve Fields, Update Rules)
ArcPy	arcpy.CleanPseudoNodes(input dataset, output dataset, "Dissolve Fields", "Update Rules")

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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