I have two line segments that overlap nodes. I want to select them, and merge them into one complete segment, so that the overlapping nodes are combined to one node.
[GIS] Merging two segments with overlapping nodes in QGIS
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Related Solutions
The current version of QGIS (QGIS 3.0+) has the option to Force segments to be exactly of a given length, except for the last one using v.split. v.split is accessed from the Processing Toolbox under GRASS --> Vector
A useful tool is the integrate tool, which will be easier than the create centerline tool. Make sure that you use this tool on a copy of your dataset or in an edit session (in case your tolerance was too large) because otherwise you cannot go back.
Also note that you can set an tolerance (in the environment settings) when you use a tool like "dissolve" in order to handle "nearly coincident" line as if they were coincident.
Finally, for more control on what you are doing, you could create a map topology, set "must not overlap" as a rule and use the ad hoc tools to clean the errors.
Best Answer
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.