Skip to main content
Solved

PointOnPoint Overlayer

  • June 25, 2018
  • 3 replies
  • 57 views

Forum|alt.badge.img

Hello,

I'm using the PointOnPoint Overlayer to find if any points overlap. When I use the transformer and let the workbench run, I get an attribute value of _overlap: 72, for each individual point. None of the points overlap (see attached picture). I thought I would get an overlap value of 1 because the points do not overlap. Is there a reason why each point is getting an overlap of 72?

*the total number of points in the file is 72*

Thanks!

 

David

Best answer by davideagle

I wonder if you've over-cooked your 'Point Tolerance' parameter? If you set it too large, i.e 100 for 72 points that are clustered within say a 50 meter radius of each other, you'll have 72 overlaps. Try setting the tollerance to say a value of 0 for exact overlaps or 1 for overlaps within 1 meter*.

* Assumes of course your data is in a native Meter based coordinate reference system (CRS). Otherwise, replace with Feet or Degrees!

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.

3 replies

davideagle
Contributor
Forum|alt.badge.img+22
  • Contributor
  • 578 replies
  • Best Answer
  • June 25, 2018

I wonder if you've over-cooked your 'Point Tolerance' parameter? If you set it too large, i.e 100 for 72 points that are clustered within say a 50 meter radius of each other, you'll have 72 overlaps. Try setting the tollerance to say a value of 0 for exact overlaps or 1 for overlaps within 1 meter*.

* Assumes of course your data is in a native Meter based coordinate reference system (CRS). Otherwise, replace with Feet or Degrees!


Forum|alt.badge.img

I wonder if you've over-cooked your 'Point Tolerance' parameter? If you set it too large, i.e 100 for 72 points that are clustered within say a 50 meter radius of each other, you'll have 72 overlaps. Try setting the tollerance to say a value of 0 for exact overlaps or 1 for overlaps within 1 meter*.

* Assumes of course your data is in a native Meter based coordinate reference system (CRS). Otherwise, replace with Feet or Degrees!

Hi @1spatialdave,

 

The point tolerance is set to .1 meters. I will try setting it to 0 and see what happens.

 

Thanks!

 


Forum|alt.badge.img

I wonder if you've over-cooked your 'Point Tolerance' parameter? If you set it too large, i.e 100 for 72 points that are clustered within say a 50 meter radius of each other, you'll have 72 overlaps. Try setting the tollerance to say a value of 0 for exact overlaps or 1 for overlaps within 1 meter*.

* Assumes of course your data is in a native Meter based coordinate reference system (CRS). Otherwise, replace with Feet or Degrees!

I adjusted the tolerance to 0 and I received values that I was more expecting. It's weird that with a tolerance set to .1, I was receiving much different results. Thanks for the help!