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 function works like the UNSPLIT command of ArcEdit. 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 Wizard has several advantages over the dissolve function of GeoProcessing Wizard:
- Multiple dissolve fields can be used
- Works like the UNSPLIT command of ArcEdit – 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
If multi-part features are already present in the layer to be dissolved, the Clean Pseudo Nodes Wizard will explode them first. The attributes will be distributed as follows:
- For the fields that the user has selected SUM as an update rule, the values will be proportionally distributed between the parts
- For the rest of the fields the attributes will be copied over.
It is recommended the Explode Wizard 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 string and 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”	After Dissolve: Standard tool
	The topology is destroyed – no node in the intersection point of the two streets
After Clean Pseudo Nodes: ET GeoWizards Update rules: L_F_ADD – Address Range –Paired field – L_T_ADD R_F_ADD – Address Range –Paired field – R_T_ADD
Preserved topology. Address ranges updated correctly

ToolBox implementation
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Command line syntax

ET_GPCleanPseudo <input_dataset> <out_feature class> <dissolve_field_list> {Update_Rules_List}

Parameters

Expression	Explanation
<input_dataset>	A Polyline feature class or feature layer
<out_feature class>	A String - the full name of the output feature class (A feature class with the same full name should not exist)
{dissolve_field_list}	A String - a list of field names to be used for dissolving.
{Update_Rules_List}	A String - a list of fields with their update rules.

Scripting syntax

ET_GPCleanPseudo (input_dataset, out_feature class, "dissolve_field; dissolve_field","field update_rule; field update_rule; field update_rule")

See the explanations above:
<> - required parameter
{} - optional parameter

Example Python script:

import arcpy
arcpy.ImportToolbox("C:/Program Files/ET SpatialTechniques/ET GeoWizards 11.0 for ArcGIS 10.1/ET GeoWizards.tbx")
arcpy.gp.toolbox = "C:/Program Files/ET SpatialTechniques/ET GeoWizards 11.0 for ArcGIS 10.1/ET GeoWizards.tbx"
input_dataset = "C:\\data\\streets.shp"
result = "C:\\data\\fgdb_test.gdb\\dissolved"
arcpy.gp.ET_GPCleanPseudo (input_dataset, result, "Name;Type", "Meters Sum; Suburb First; L_F_ADD Range Address L_T_ADD ;L_T_ADD Range Address L_F_ADD")