I have created a river network as polyline shapefile for training purposes. No I wanted to integrate undershoots/overshoots that needs to be detected and corrected from the participants.
I have used the snapping option to generate the polyline shapefile. I used as rule within the Topology Checker Plugin: "must not have dangles". The QGIS User Guide is saying (QGIS User Guide) that this rule is "show the overshoots in the line layer". Actually all end- and strating points are detected as error, even if they share a vertex and are connected to each other. I think dangles are per definition something else. Have a look to the definition of GIS-Lounge, dangles are: "Dangles or dangling nodes are lines that are not connected but should be. With dangling nodes, gaps occur in the linework where the two lines should be connected. Dangling nodes also occur when a digitized polygon doesn’t connect back to itself, leaving a gap where the two end nodes should have connected, creating what is called an open polygon."
Am I right, that Topology Checker Plugin is not able to detect undershoots/overshoots? If yes, is there any other possibility how to easily to it within the QGIS environment?