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I have 1000 lines and 1 route or road line. I want to automatically my lines adjust to route or road without erasing all data in the attribute table. My expected results, 900 lines will same with the route. I used QGIS 2.18

This is my lines

enter image description here

and this is the route/road line enter image description here

  • Can you upgrade to QGIS 3.0? Snap geometries to layer tool does exactly what you want to. – Kazuhito May 23 '18 at 5:00
  • I will try to upgrade my QGIS. @Kazuhito Is it (Snap geometries to layer) plugin? – Arief May 23 '18 at 5:05
  • You can find it in Processing Toolbox | (QGIS) Vector geometry – Kazuhito May 23 '18 at 5:08
  • I upgrade my QGIS and use Snap geometries to layer, but I get error result. Error Message Message _Feature (508) has invalid geometry. Please fix the geometry or change the Processing setting to the "Ignore invalid input features" option. Execution failed after 0.86 seconds – Arief May 23 '18 at 5:42
  • Oh. Have you been successful in removing geometry errors? – Kazuhito May 23 '18 at 9:54
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Hopefully you can fix the geometry error soon. After that, please try Snap geometries to layer which is available in QGIS 3.0.

A small test:

Input: Line 1 (green) and Line 2 (red)

enter image description here

Output: Snapped Line 1 (green dots) and Line 2 (red dots)

enter image description here

There are some corners left unsnapped. If you see such incomplete lines, please repeat using this tool again. I mean, snap using the snapped line.

Final output:

enter image description here

  • Thank you for complete answer, but first I have to clean all errors,,, thank you – Arief May 23 '18 at 13:03
  • @Arief yes, cleaning dataset is the most time consuming part... Good luck. – Kazuhito May 23 '18 at 13:07

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