+9Hello Forum.
I have two polygon datasets (see attached image). I'd like to create a third polygon dataset showing me the sections of A that do not overlap with B. So, it would create me the polygons as highlighted in C in attached image.
I could do this via a few steps in a desktop GIS but I need to include it as part of a larger automated data flow in FME Desktop (Form).
Thanks,
+38Clip polygon A with Polygon B and keep the output from the Outside Port, followed by a deaggregator
+31I would use an AreaOnAreaOverlayer, generating a list on the attribute that uniquely identifies if the area is A or B (this could be the fme_basename format attribute, if they are from different datasets). Then, feed those results into a Tester or TestFilter where the condition would be _overlaps = 1, AND _list{0}.identifier = A.
+9I would use an AreaOnAreaOverlayer, generating a list on the attribute that uniquely identifies if the area is A or B (this could be the fme_basename format attribute, if they are from different datasets). Then, feed those results into a Tester or TestFilter where the condition would be _overlaps = 1, AND _list{0}.identifier = A.
+31You'll need to make sure you set it up in the transformer. _list is the List Name that you give it.
+9+31In the AreaOnAreaOverlayer. Although, the solution from @ebygomm is a really good one as well. I'm used to working with extremely dense data, and sometimes the Clipper can struggle with it. So I usually default to the AreaOnAreaOverlayer method.
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