topic Re: Identify lines that do not join to others in ArcGIS Pro Questions

Identify lines that do not join to others

CMcDonald — Wed, 22 Oct 2025 14:56:12 GMT

Hello,

I would like to identify lines in a feature class that are dangling and not connected. Image below with red circles shows the issues.

I have an ArcGIS Pro Standard licence.

Thanks

Re: Identify lines that do not join to others

Robert_LeClair — Wed, 22 Oct 2025 15:09:12 GMT

There's a couple ways to do this:

1. If you have the Data Reviewer extension, there is a Find Dangles GP tool that identifies dangling nodes.
2. Likely the easier way is to create a geodatabase topology with the Must not Dangle Topology rule.

Re: Identify lines that do not join to others

JenniferCadkin — Wed, 22 Oct 2025 21:01:08 GMT

Vertices and Nodes was released with ArcGIS Pro 3.5-- it provides a visual way to identify dangles.

https://pro.arcgis.com/en/pro-app/latest/help/editing/symbolize-vertices-and-nodes.htm

https://pro.arcgis.com/en/pro-app/latest/help/editing/change-vertices-and-nodes-settings.htm

Re: Identify lines that do not join to others

CMcDonald — Fri, 24 Oct 2025 10:52:01 GMT

Thank you @Robert_LeClair I am new to Topology so have been learning how to use this and found it very useful for future use also.

The issue I have with "Must not Dangle" is that it has generated around 450 point errors in my Line dataset. Looks like intersections are being detected also? The image below is not 4 separate lines, I have used the Pairwise Dissolve tool to create lines for each route rather than lots of individual segments as that is what I am required to output.

Any ideas?

Thanks

Re: Identify lines that do not join to others

Robert_LeClair — Fri, 24 Oct 2025 14:50:34 GMT

Reading the rule - "the end of a line must touch any part of one other line or any part of itself within a feature class" - I "think" what may be happening is there may be coincident lines on or near the yellow symbol. You could zoom in and do an interactive select to see if there is one or more selected features. Not sure but just a guess.

The Planarize tool will find and delete coincident features.