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I've searched a lot but didn't find an answer: When editing lines with QGIS, I often need to split a linestring exactly on one of his existing internal vertices, but I can't find a way; I've tried the tool "Split Features" thinking that it could snap on vertices, but I was wrong, and I've tried several ways of selecting the vertex with no luck... any solution?

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2 Answers

In Snapping Options (Settings menu) enable snapping (better snapping to vertex only in your case as suggested in comments) for your layer, then using Split feature tool make a left click on the one blank space on side of the line, then make left click on the vertex where the split should occur and in the end make a right click on the blank space on the other side of the line.

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+1 - I'd add, enable snapping to vertex only, to reduce the risk of snapping to the segment. –  Simbamangu Oct 23 '12 at 15:05
    
@Simbamangu, ok) –  SS_Rebelious Oct 23 '12 at 16:46
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You might want to check the snapping tolerances as well. If they are on zero it can seem like snapping doesn't work properly.

http://docs.qgis.org/1.8/html/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html

Thanks and hope this helps.

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