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I split sections of a roads on a map using polygons and now I would like to dissolve the roads within those polygons, but I only want to dissolve rows that have the same road name. (Roads are lines).

enter image description here I'm trying to use the ModelBuilder(arcgis 10.1) to iterate through all of the different polygons and take the different road names, and if both of these conditions are met, the roads would dissolve. This is what I have so far (MACK is the name of a polygon), and it just runs as a constant loop, so I don't think it's right.]enter image description here enter image description here Dissolve parameters.

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  • Are your polygons all in the same feature class or is each polygon in a separate feature class? Are the lines already split? And could you add a screenshot of your Dissolve parameters?
    – GISGe
    Jan 16, 2015 at 13:57
  • @GISGe They're in a database together but in seperate feature classes. And they are already split at the edges of the polygons.
    – EmilyF
    Jan 16, 2015 at 14:10

2 Answers 2

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You have to define a dynamic name for the output of the Dissolve tool, otherwise it will be overwritten each time the iterator processes a polygon feature class. 'Name' is the name of each feature class being iterated, you can use it by naming the output something like C:\Users\...\Default.gdb\MACK_%Name%.

See the 'Note' section of the help page A quick tour of using iterators for more details.

For the rest your model looks OK.

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Well, assuming your polygons have some unique identifier, be that a GridID, unique feature ID, or even GlobalID, probably one of the easiest methods would be to use any of several available methods (I'd recommend ideally merging all the polygons together into one FC and then spatially joining that polygon FC to the split roads), to transfer the unique ID of the polygon each road segment is in to the road. Then you could simply run the dissolve once, using both the road name and the unique polygon ID fields as the dissolve fields, instead of having to deal with the iterator and tons of separate files. (Unless of course you really want each set in separate feature classes)

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