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I'm modifying the existing water pipeline network. Sometimes I have information that the pipe from the beginning to the 125meter has a diameter 63mm after that point it has a 100meter -diameter 50mm and the rest of it 32mm. I need to split that 1 pipe into 3 pipes:

  • 125meter,
  • 100meter,
  • and the rest of what was left (to give different diameter attributes(63,50,32)).

And I also need it to be modified in the same shapefile. Advanced digitizing and v.split don't work in this situation.

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  • 3
    Are you asking how the split lines by length tool works?
    – Erik
    Commented Jul 28, 2022 at 8:36
  • Previously I was working in ArcGIS pro and it was very easy and fast to solve this kind of problem(splite tool- trace by length limit). It just modifies the lines as required. In Qgis I can't find the right tools to do this.
    – Levon Batoyan
    Commented Jul 28, 2022 at 10:17
  • Well, have you tried the split lines by length tool?`
    – Erik
    Commented Jul 28, 2022 at 10:41
  • If you mean GRASS- v.splite then yes (I can't find other split lines by length tool). it creates a new layer but does not modify existing.
    – Levon Batoyan
    Commented Jul 28, 2022 at 10:48
  • 1
    I think you need to provide more details on what you're trying to do.
    – Erik
    Commented Jul 28, 2022 at 11:10

1 Answer 1

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A workaround:

Create a point layer with points as the split distances using "Geometry by expression":

collect_geometries(array_foreach( array(100,225), end_point(line_substring( $geometry, 0, @element))))

Snap the split tool line to the points

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