Feature request #9326

Tolerance (snapping) during analyses

Added by Paolo Cavallini over 10 years ago. Updated about 6 years ago.

Pull Request or Patch supplied:No Resolution:
Easy fix?:No Copied to github as #:17933


In case of layers with essentially the same shapes, with different precision, the diff between these layers produces a number of virtually 0 width polygons.
These microareas are tricky and time consuming to remove (if they are isolated, a possible solution is to select and remove those smaller than an arbitrary threshold, but if they are linked to some "real" polygons, this will not work).

I suggest to add a parameter in analyses, to either snap original data within a threshold before running the analysis, or to clean up the results afterwards


#2 Updated by Paolo Cavallini about 10 years ago

Probably this could be solved with a new command, allowing the user to arbitrarily reduce the precision of coordinates (filling up the rest with 0s).

#3 Updated by Giovanni Manghi over 7 years ago

  • Category changed from 44 to Processing/QGIS

#4 Updated by Giovanni Manghi almost 7 years ago

  • Easy fix? set to No

#5 Updated by Paolo Cavallini about 6 years ago

  • Status changed from Open to Feedback
  • Description updated (diff)

Still valid? With automatic reprojection now in Processing the issue can be even more serious.

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