Hello everyone,
I have a street centerline dataset and I would like to identifying where there are T intersection (3 centerlines intersect at same point). Here is the image and I would like to find the highlighted lines. 
Thanks in advance.
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Identifying T intersection in the street centerline
+6- Enthusiast
Best answer by daveatsafe
Hi @jugoslaviaa,
You can use the TopologyBuilder transformer to create nodes at the intersections. The output nodes will have a list on them with id of the adjoining line and its bearing from the node. The ListElementCounter and a Tester can be used to find the nodes with three lines radiating from them.
+44- Evangelist
Hi
Please, try to create a point geometry in all Intersection lines - transformer Intersection and after to find relationship between points with 3 lines connected
Thanks
Danilo
+19- Safer
- Best Answer
Hi @jugoslaviaa,
You can use the TopologyBuilder transformer to create nodes at the intersections. The output nodes will have a list on them with id of the adjoining line and its bearing from the node. The ListElementCounter and a Tester can be used to find the nodes with three lines radiating from them.
+44- Evangelist
danilo_fme wrote:
Hi
Please, try to create a point geometry in all Intersection lines - transformer Intersection and after to find relationship between points with 3 lines connected
Thanks
Danilo
Hi @jugoslaviaa
Just for complement my answer - inside the transformer Intersector there is the option Generate List, please check this option and create a List of elements:
And after this transformer - you can use the transformer ListElementCounter ( like suggest you @daveatsafe ) then the transformer Tester to filter the number of elements that you want = 3.
Thanks,
Danilo
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