I have a polygon layer with many circle polygons in it, which are overlapping each other.

I now would like to cut off the overlapping areas at their cutting edge:

enter image description here

enter image description here

I use QGIS 2.2 and couldn't find a tool to do it, all vector tools are only working if there are two different layers to cut (there is now way to convert it to different layers because I have over 100 polygons, which are overlapping each other different times.)

  • I don't know why, but this site always cuts my introducing "Hi" in this thread,even when i editet it, so now you get it this way afterwards: HI ;-)
    – Jan
    Apr 8, 2014 at 6:33
  • I think we've had that question before but I can't find it right now.
    – underdark
    Apr 8, 2014 at 16:47

1 Answer 1


You can perform this using the v.clean tool set provided by GRASS. Take a careful look at the break and bpol tools. From QGis you can access this tool set either through Sextante or the GRASS plug-in.

  • First of all, thanks for your quick answer! I tried different v.clean tools at a test layer with two overlapping polygones (like in the example above), but there is no effect on the shapes!? Do you have any hint, what could be my error here?
    – Jan
    Apr 10, 2014 at 11:56
  • I can't say. Can you make this layer available somehow, e.g. posting the GML at Pastebin? Apr 10, 2014 at 12:47
  • I tried it again with one of my "real" layers, but without difference. I uploaded the gml (zipped with7Zip) here: file-upload.net/download-8805199/Test_Buffer.7z.html
    – Jan
    Apr 11, 2014 at 7:24
  • Maybe its helpful to know what i have in mind with this. The circles are production areas of different places. When they share space, it should be splitted 50/50 to both of them. Thats why i want to cut them at the cutting edges like shown above.
    – Jan
    Apr 11, 2014 at 7:29

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