Skip to main content
Solved

How to create new dataset of overlapping areas?

  • August 2, 2023
  • 4 replies
  • 72 views
epro_admin
Contributor
Forum|alt.badge.img+7

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

This post is closed to further activity.
It may be an old question, an answered question, an implemented idea, or a notification-only post.
Please check post dates before relying on any information in a question or answer.
For follow-up or related questions, please post a new question or idea.
If there is a genuine update to be made, please contact us and request that the post is reopened.

4 replies

geomancer
Evangelist
Forum|alt.badge.img+60
  • geomancerEvangelist
  • Evangelist
  • August 2, 2023

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.

epro_admin
Contributor
Forum|alt.badge.img+7
  • epro_adminContributor
  • Author
  • Contributor
  • August 2, 2023

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
Evangelist
Forum|alt.badge.img+60
  • geomancerEvangelist
  • Evangelist
  • Best Answer
  • August 2, 2023

Hi, then maybe my wording was poor ;)

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

image

epro_admin
Contributor
Forum|alt.badge.img+7
  • epro_adminContributor
  • Author
  • Contributor
  • August 3, 2023

@geomancer​ Oh gotchya! Thank you.

Community Stats

32,154
Posts
122,047
Replies
39,812
Members

Latest FME

Terms & ConditionsCookie settingsAccessibility statement
A product of
Safe Software respectfully acknowledges that we live, learn and work on the traditional and unceded territories of the Kwantlen, Katzie, and Semiahmoo First Nations.