SingleClass = os.path.join(outLoc, outName + '_singlePart')Īrcpy.Buffer_analysis(inFC, bufferClass, 500, '', '', 'ALL')Īrcpy.MultipartToSinglepart_management(bufferClass, singleClass)Īrcpy.AddField_management(singleClass, 'INDEX_ID', 'LONG') WhereClause = '%s = %s' % (fieldDelimited, value)īufferClass = os.path.join(outLoc, outName + '_Buffer') import arcpy, osĭef buildWhereClause(table, field, value):įieldDelimited = arcpy.AddFieldDelimiters(table, field)įieldType = arcpy.ListFields(table, field).type if the networks are really close together you can set the buffer distance lower.

The buffer allows for every part of a network, whether it is connected or not, to be considered part of it by using the buffer distance as a 'tolerance'. It works by putting a small buffer around all of the stream features and indexing them(adds a field that is used later in the script to dissolve). The following is a complete script that will do what you need.

I think the best way to do this is in arcpy. That has worked for me but like I said the scripting methods may be preferable for other people. Use the dissolve tool again to dissolve the lines based on the unique ID. Use the spatial join tool to add the unique polygon ids to each line that intersects or is within the polygons. This created individual polygons for each of the connected line groups. Use the dissolve tool with the Unsplit option checked.

The scripts that and have created may well work (if you have access to ArcGIS 10.1 and the database access functions), so if someone else had this problem please check those options out as well.Ĭreated a very small buffer polygon around the lines (0.1 metres) to make sure there was crossover between the lines that were connected. I've devised a way of doing it with little bits from all of the other answers.

Arcmap dissolve