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I'm trying to cut donut polygons ready to go into a system that can't display them. Basically the exact opposite of this post: How to convert fake donut holes in polygons to real ones?

I want to cut at any point so that the polygon no longer contains an inner ring(s). (Ideally the shortest path but I don't really care.)

Is this possible in QGIS?

  • At least QGIS does not report such polygons as topology errors. Tested with POLYGON (( 192 471, 473 507, 469 292, 371 280, 375 180, 564 184, 564 282, 469 292, 473 507, 755 490, 717 93, 177 80, 192 471 )) However, I do not know how to convert holes into outer ring loops with QGIS. I think that this was rather common requirement in GIS software of the 1990s but not nowadays. – user30184 Jul 17 '15 at 14:09
  • Im using software that doesnt support spatial data yet and uses those same 90's standards for drawing polygons. Any other open source tools you know of that can do this? – AK9 Jul 17 '15 at 16:15
  • Do you need an automated solution or is manual sufficient? – underdark Sep 4 '16 at 15:49
  • Not manual to the extent i actually have to draw slice lines for each polygon. As long as there are a series of steps I can use by hand on a large overlay i dont mind. – AK9 Sep 8 '16 at 14:40

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