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How to create new dataset of overlapping areas?

  • Aug 2, 2023 5:59 AM UTC
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epro_admin
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I have one dataset that has overlapping polygons. I want to advise the data owner of this and ask guidance for what to do when I come across these overlapping areas.

 

I think the best way to do this is to show them all the overlapping areas. I was able to add on the overlap counts to each polygon (AreaOnAreaOverlayer) which is great, but what I really want is to create a new dataset with the overlapping areas.

 

I have had a look at the AreaOnAreaOverlayer and Clipper. Is anyone able to provide further guidance or point out if I should be using a different transformer combination?

Best answer by geomancer

Hi, then maybe my wording was poor ;)

I think with the procedure I described you get exactly the areas you need.

image

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4 replies

geomancer
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  • geomancerEvangelist
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  • Aug 2, 2023 6:53 AM UTC

The AreaOnAreaOverlayer has a parameter Overlap Count Attribute (the default value is _overlaps).

Add a Tester or a TestFilter. When _overlaps > 1 there are overlapping areas at that location.

Just try it!
epro_admin
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  • epro_adminContributor
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  • Aug 2, 2023 12:50 PM UTC

Hi @geomancer​ , Thanks for your reply. That was poorly worded on my part. I've attached a screenshot of what I mean. I want to extract into a new layer all the parts that overlap, not polygons that overlap.

 

Here the green and purple polygons overlap at the pink. The pink is what I want to extract into a new layer. Is there a way to do that through the AreaOnAreaOverlayer and/or does that involve clipping, but I the overlaps reside in one layer not two, and the Clipper requires two a clipper and candidate.

 

image

geomancer
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  • geomancerEvangelist
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  • Best Answer
  • Aug 2, 2023 12:55 PM UTC

Hi, then maybe my wording was poor ;)

I think with the procedure I described you get exactly the areas you need.

image

Just try it!
epro_admin
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  • epro_adminContributor
  • Author
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  • Aug 3, 2023 12:12 AM UTC

@geomancer​ Oh gotchya! Thank you.

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