I have a polygon layer which looks like this enter image description here.

I used the QGIS multiparts to singleparts tool and also polygon to lines. In both cases i got this type of result

enter image description here.

I want to extract polygon into individual lines like thisenter image description here

  • this looks like a similar question, which may answer the question - gis.stackexchange.com/questions/48461/…
    – Mark
    Sep 4, 2013 at 8:11
  • I don't think the question is similar, and the answer is not useful as well. I use sextante in qgis.
    – neogeomat
    Sep 4, 2013 at 8:15
  • not even if you convert the polys to lines first?
    – Mark
    Sep 4, 2013 at 8:28

1 Answer 1


You could use line-to-polygon tool (See How can I transform a polygon to a linestring in QGIS?) followed by v.clean command (See http://grass.osgeo.org/grass64/manuals/v.clean.html).

  • Is there something for qgis
    – neogeomat
    Sep 4, 2013 at 8:59
  • The first tools is from QGIS and is available through sextante analysis tools; Second comand is from GRASS, but is also available through Sextante (You need to have grass installed and configured in sextante). Sep 4, 2013 at 11:28
  • take a look at : gis.stackexchange.com/questions/32192/…
    – Kurt
    Sep 4, 2013 at 15:17
  • first i used v.clean with break tool, then v.clean with rmdupl tool. The result are as i want but there are duplicates.
    – neogeomat
    Sep 4, 2013 at 17:26

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