I am trying to do digitizing in QGIS, but I do not see an option that I have seen in ArcGIS - autocomplete polygon. I would like to make two adjacent polygons topologically correct, and can not find such an option in QGIS.

  • You might indicate what version of QGIS you are using. There is this thread: gis.stackexchange.com/questions/12331/…, but in my version of 2.14 there is no Avoid Intersections box. However, you might try checking Settings - Snapping Options - Enable Topological Editing and see if that works.
    – johns
    Mar 23 '16 at 16:53

You must open "Snapping options" under settings and mark the layer that you want to draw and "adjacent polygon". Then mark "Avoid Intersection".

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