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Editing shapefile from QGIS in ArcMap causes errors according to QGIS topology check?

Geographic Information Systems Asked by Etiënne Thomassen on July 20, 2021

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)

enter image description here

Next I edit this layer in ArcMap, creating a hole between two of the polygons

enter image description here

Then I use the QGIS topology checker again, yielding 3 additional errors.

enter image description here

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?

One Answer

The method suggested in the comments by csk works for cleaning the geometries

I created the errors in the below image using ArcMap 10.6 by simply moving vertices and placing them back on their original location. In QGIS the topology checker reports these overlaps.

enter image description here

Using snap geometries to layer from the processing toolbox resulted in a shapefile without overlap or gaps. See below screenshot for the settings (I think the English name for the mode will be snap to anchor nodes as suggested by csk)

enter image description here

Answered by Etiënne Thomassen on July 20, 2021

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