I noticed Polygon shapefiles that were edited with ArcMap yield many errors in the QGIS Topology checker.
The picture below shows a polygon Shapefile. I made one error on purpose so the topology checker shows there is just one error (checking for overlap within the layer)
Next I edit this layer in ArcMap, creating a hole between two of the polygons
Then I use the QGIS topology checker again, yielding 3 additional errors.
Now my questions are:
- Can I change some settings in ArcMap so that it will not create this difference? I think it might be saving the vertices of the edited polygon with a lower precision.
- if it is not possible to fix it in ArcMap, then what is the quickest method to clean these tiny errors quickly afterwards with either QGIS or PostGIS?
snap geometries to layer
and snap the layer to itself, with a very small tolerance. You probably don't want the default behavior ("prefer aligning nodes, insert new vertices where required"), but rather "snap to anchor nodes" or "prefer aligning nodes, don't insert new vertices". – csk Jun 4 '19 at 20:09