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I have a raster layer (3 cm x 3 cm) and a vector layer with polygons and when I try to clip the raster by the polygon layer to have just the bare earth/ground regions left over, so I can interpolate them afterwards, I always get the error below:

Warning 1: Ring Self-intersection at or near point 571.37754947319627 322.188317745924 
ERROR 1: Cutline is not valid after transformation 

The polygon layer was derived from the raster layer.

I am working with QGIS.

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    Try buffering the vector layer with a buffer size of 0. Sounds weird, but helps sometimes.
    – underdark
    Commented Nov 8, 2016 at 20:22
  • Thanks for your answer, but maybe I didn't really get it: If I buffer a layer with a buffer size of 0 in the distance field, shouldn't I get an empty layer?
    – Moo
    Commented Nov 8, 2016 at 20:39
  • No. The buffer adds to the input geometry. In this case, it adds nothing but might clean up some errors.
    – underdark
    Commented Nov 8, 2016 at 20:43
  • So when I set the Fixed Distance Buffer with a distance of 0.0, it creates a new layer with no visuable data.... this is probably not the expected result?
    – Moo
    Commented Nov 8, 2016 at 20:52
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    It may mean that the source geometry has such problem with the topology that buffer operation fails.
    – user30184
    Commented Nov 8, 2016 at 21:12

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