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After running QGIS Difference Tool, I get a lot of differences, but I don't know where they are coming from. The input files are almost similar...

Input Image (overlay input almost the same, but from different years with one or two different polygons):

Input Image

Difference Output:

Difference Output

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  • i realized though, that some of the vertexes are not connected to each other? might this be the problem? is there an easy way to fix this? – ann chi Feb 24 '20 at 10:11
  • Maybe first perform a topology check and then fix. – b_jugger Feb 24 '20 at 10:21
  • @annchi usually, it is the first reason of that. – user156679 Feb 25 '20 at 16:00

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