I have a line that I drew where the ends are not connected. I now want to select the two end nodes and hit a button to have QGIS connect them with a line segment. How do I do this?
[GIS] QGIS: Connect two nodes with line to close segment
lineqgis
Related Solutions
If the nodes of the two lines are snapped to each other, then select the two lines and use Merge Selected Features Tool which its icon is shown below
Then a prompt menu will appear to tell you which feature's attribute you are going to use. Please note that after merging the two lines, the vertex will not disappear, the vertex the connect the two lines will still exist because it depends on the angle between two lines. However, if you want to completely remove the vertex to completely turn it into a straight line, then you simply need to go to select Node Tool - as shown below - and click on the vertex that you want to delete until it turns to blue color, then press delete on your keyboard to delete the vertex completely after merging.
You could try Overpass API to identify nodes where both highway=motorway and highway=motorway_link ways intersect. Here's an example:
[bbox:{{bbox}}];
way[highway=motorway];node(w)->.a;
way[highway=motorway_link];node(w)->.b;
node.a.b;
out;
Try it in overpass turbo! http://overpass-turbo.eu/s/qDZ
Best Answer
Activate Snapping (Settings --> Snapping options...). Select required snapping mode and set at least Snap to (To vertext for your case) and some Tolerance value.
Than just edit layer and draw new line segment connecting two nodes. Now when you move cursor close enough to node when drawing line, the line will snap to the node (showing you the pink cross). Distance of snap is depend on Tolerance value.
For more information about snapping see QGIS User Guide
note: You can't snap to nodes which are just being drawn. It works only for already drawn features.