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Intersection points


Hello FME'rs,

 

 

What I'd like to do is intersect two line feature classes to produce an intersection POINT output feature class.  

 

 

This is a relatively simple task to perform in the Arc geoprocessor (overlay->intersect).  However, my first few attempts with FME (using lineonline overlay) doesn't quite yield the results I want as it appears the give me the intersection points as well as ALL the start/end points of the intersecting line segments.

 

 

Can someone kindly point me in the right direction?

 

 

Thank you :)

 

JP

Best answer by fmelizard

Hi JP,

 

 

Create a list in the lineonlineoverlayer.

 

After overlaying, test the point features (geometry filter) to return only the points with a list that includes attributes of both features.

 

 

Hope this helps.
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7 replies

fmelizard
Contributor
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  • Contributor
  • Best Answer
  • March 29, 2013
Hi JP,

 

 

Create a list in the lineonlineoverlayer.

 

After overlaying, test the point features (geometry filter) to return only the points with a list that includes attributes of both features.

 

 

Hope this helps.

david_r
Celebrity
  • March 30, 2013
Hi JP,

 

 

the easiest might be to just use the TopologyBuilder. It will output all the intersection points (nodes) without any further processing.

 

 

David

david_r
Celebrity
  • March 30, 2013
Sorry, apparently I missed the part about the start/end points. Use the CoordinateExtractor with the values 0 and -1 to get the start/end points and a 2DPointReplacer to convert them into points.

 

 

David

  • Author
  • April 1, 2013
Hello Itay/David,

 

 

Thank you both for your quick and clear responses.  I believe I understood your answers well enough to make an attempt and currently in the process of doing so (the workbench is chugging away ...).  I don't know approach works best but once I'm done or stuck (and likely the latter) I'll let you know.  Thanks again.

 

 

regards,

 

JP

  • February 9, 2014
Hi all,

 

 

I cant bring the attributes from the point to a new shapefile. The values of the attributes List that store the ID of the lines that intersect at the point are not copied even doing Auto-connect attribute.

 


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  • April 27, 2023
david_r wrote:
Hi JP,

 

 

the easiest might be to just use the TopologyBuilder. It will output all the intersection points (nodes) without any further processing.

 

 

David

Hi David,

 

Could you please give a quick example?

 

Many thanks!


david_r
Celebrity
  • April 27, 2023
siriosus wrote:

Hi David,

 

Could you please give a quick example?

 

Many thanks!

Have a look at these tutorials:

https://community.safe.com/s/article/building-topology-calculate-route-length-topologyb

https://community.safe.com/s/article/Building-Topology (step 11)

If something is still unclear, consider posting it as a separate question for maximum visibility.


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