1

I have 2 polygon feature class's (A and B) that overlap each other.

I want to select all the polygons of feature class A where the total overlapping area of feature class B polygons is less than 10m2 using ArcPro.

There may be multiple polygons overlapping

enter image description here

I was able to do this when there is only 1 overlapping by doing this:

  1. Union of feature class A and B
  2. Clip the union output with Class A feature class as clip feature
  3. Definition query on the output to only show polygons with an area less than 10m2
  4. Select by location on feature class a with step 3 output as the intersecting feature

But I am not sure how to do this when there are more than 1 polygons of feature class B overlapping feature class A

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  • 2
    Intersect. Summarise area in output by b polygon id. John to b table.
    – FelixIP
    Jan 9 '20 at 0:00
  • Thanks, This worked.
    – JUNGLE
    Jan 20 '20 at 0:47
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Since you are not concerned with which of the B geoms overlap the target A geom, you might try a different approach:

1) Calculate the area of each feature in A -> OrigArea

2) Get the difference of A and B (using B as the overlay) -> Difference

3) Calculate the area of each feature in Difference output -> NewArea

4) Compute Delta = OrigArea-NewArea

5) Join the Difference.Delta column back to A and select where Delta < 10m2

enter image description here

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4
  • What software is it?
    – FelixIP
    Jan 9 '20 at 1:55
  • Hi @FelixIP, the images are from a quick QGIS mockup. I don't currently have an ArcDesktop license but I thought a generic approach might still be helpful.
    – OGmaps
    Jan 9 '20 at 4:45
  • Unfortunately terminology is too different, I struggle to understand. Why do you need original area anyway?
    – FelixIP
    Jan 9 '20 at 5:56
  • @FelixIP, I get the original area of features in A so that I have it in the output of the Difference operation. That way its just OrigArea-CurrentAreaOfPolygon to get the total overlapping area of features in B.
    – OGmaps
    Jan 9 '20 at 6:31

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