I need to find boundaries between two polygon layers and express them as lines. There are plenty of polygons in each layer, so I'd like to avoid doing it "by hand".
Red line shows how boundaries should look.
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This could be done directly with the "polygon to line" toolbut you need an advanced licen in order to use it. However, you need to handle the lack of precision (e.g. using integrate on a copy of your dataset).
Alternatively, you could isolate the green and the orange polygons in two layers and compute their intsection with line outputs (define a tolerance in the tools parameter to account for the lack of precision).
This might help. "How To: Convert shapefile polygons to polylines" http://support.esri.com/technical-article/000004861