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I need to edit line features in QGIS 3.4.4. I have more than 1000 line features that I want to first merge and then split. The line features describe roads in useless intervals, my goal is to highlight specific parts of the roads after set intervals.

I want to do the following:

  • Merge connecting lines into a single feature of the whole road. If there is no easy solution I might have to select and merge them by hand.
  • Split the lines up into parts after set distances, e.g. first after 5 kilometers, next after 1.2 kilometers etc.

I already tried the v.split script, but I only manage to split the line into equal parts. The best solution for splitting would look something like this in ArcGIS:

https://www.youtube.com/watch?v=yDQQtn1l4cQ

I only work in QGIS however.

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  • What is a your definition of connected lines? Are lines that intersect "connected"? Do you want to join segments between intersections? Feb 7, 2019 at 13:56
  • @user3386170 I uploaded this picture that might help me clarify: ibb.co/SK6J0HD As you can see, I selected a part of the road. I want to connect the whole road on the right side into one feature and the whole road on the left side into another.
    – Miquele
    Feb 7, 2019 at 14:09
  • The right side of what? Did you try Dissolve and then Multipart to singleparts (available in processing toolbox)? Feb 7, 2019 at 14:21
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    Please edit your question to include the image on this page.
    – csk
    Feb 7, 2019 at 19:48

1 Answer 1

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You can do the following things :

  1. Dissolve the layer with the continue line. Use the tool dissolve.

  2. Create points along the line with the tool Points along geometryenter image description here

  1. Use the SAGA tool Split line at points.
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  • Thank you for the help! However, the line shouldn't be split up at at regular interval but rather into several pieces with different lenghts.
    – Miquele
    Feb 7, 2019 at 15:43
  • In that case, this link should be usefull : gis.stackexchange.com/questions/232016/… Feb 7, 2019 at 16:06
  • That link provides instructions for placing points at specified distances along a line. Once you have the points you can use the split lines at points algorithm to split the lines.
    – csk
    Feb 7, 2019 at 19:47

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