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I have two polylines (say two paths/roads/etc. for example) that I want to iterate against another set of iterated polylines (ie. geologic fault lines).

I want the first iterator to take Path #1 and iterate against each "Fault Line" (the 2nd iterator). Then iterate Path #2 against the "Fault Line" polylines. How do I do this? I tried but cannot get it to work.

  • Welcome to GIS SE, can you go into more depth what you tried (steps, screen shots...etc)? – artwork21 Feb 27 '15 at 18:14
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    You need to read up on help or search forums about embedding models within models. A model can only have one iterator. – Hornbydd Feb 27 '15 at 18:18
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    Another option to consider that will give you more control would be to use a python/arcpy cursor (resources.arcgis.com/en/help/main/10.2/index.html#//…). – artwork21 Feb 27 '15 at 18:31
  • i know they can only have one iterator however if you have it as a "tool" and you add that tool it should work...correct? – Arlis Johnson Feb 27 '15 at 20:49
  • artwork21...I had created two independent paths and created an iterator for those named "path iterator". then i imported some gis data (fault lines) for different states and created a new tool to iterate through those. i then brought in the "path iterator" hoping to combine them so it would show the intersect of Path A and all the fault lines by state, then iterate through Path B and all the fault lines by state. – Arlis Johnson Feb 27 '15 at 21:26
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Create the second iterator in a separate model in ModelBuilder. Once you've got that working you can insert it as a submodel into Iterator 1. ModelBuilder won't ordinarily let you nest iterators, but it will let you include a submodel. If that submodel has an iterator in it you can get around the "1 iterator only" limit.

  • thanks! that's what i thought. apparently the submodel isn't working correctly then. – Arlis Johnson Mar 20 '15 at 14:15
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It isn't possible to use more than one iterator in a ModelBuilder model. (Ref. A quick tour of using iterators for iteration, the first "Note" towards the end.)

There are some ideas for getting around this limitation in Answers to this Question: Nesting two iterators for cost distance calculation in ModelBuilder?

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