I have a project with five lines, every element have a different ID. This is view below:

enter image description here

I want to merge only lines that there are touching. According with this conditions the lines they should become two. After this i want to export all into shapefile format. The result is view here:

enter image description here

2 Answers 2


You can do it using the following steps:

  • Add a new field name NewID of integer type
  • Give the IDs 1,2 and 3 a common NewID of 1
  • Give the IDs 4 and 5 a common NewID of 2
  • Use Line dissolve tool from Saga -> Vector line tools -> Line dissolve and choose the NewID field that you created in the first step to merge all the above lines with their common IDs
  • Ok ahmadhanb, this is being useful in the future. What i showed on the top is only a example. In truth the results must be merged 1, merged 2, merged 3... until 125. It's too much expensive that method.
    – Fabolous
    Commented Nov 5, 2018 at 14:58

Dissolve all the lines. This combines them all into one multipart feature.

Use multiparts to single parts to the multipart feature into single part features.

  • Not csk is wrong. The way of ahmadhanb right
    – Fabolous
    Commented Nov 5, 2018 at 15:26
  • Please accept the correct answer by clicking the check mark next to it so no one else wastes their time trying to answer a question which apparently has been already answered correctly.
    – csk
    Commented Nov 5, 2018 at 16:02
  • Csk when you answered i checked immediatly the correct answer. What ahmadhand wrote is a possible way but i'm sure that isn't fast method. If there are no alternatives anyway.
    – Fabolous
    Commented Nov 5, 2018 at 16:14

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