I have found that shapefiles that function normally in ArcGIS will not work in QGIS due to geometry issues. For example, I have a species geographic range file that when I intersect with a buffer will not work citing geometry issues (GEOS geoprocessing error. One or more input features have invalid geometry). When I try to fix the files in QGIS with various methods, Vector -> Geometry -> Check Geometries, convert to raster, create a buffer, manually edit out the self intersection I am unable to complete any of the processes because of geometry issues, or in the case of Check Geometries tool it runs to completion but does not seem to fix the problem. I have also run the GRASS v.clean and tried to manually edit out the self-intersection on a shapefile in QGIS but I am unable to edit the file. If I run any of these tools on the layer in ArcGIS it works no problem. This is my current solution, fix it in arc and then import it to QGIS.

My pointed question is therefore (1) have anyone experienced sensitivities to geometry in QGIS but not arcGIS, and (2) how do you fix files that seem to be rendered entirely unworkable in QGIS because of geometry issues?

closed as too broad by ahmadhanb, BERA, xunilk, aldo_tapia, whyzar Feb 1 '18 at 12:25

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    Welcome to GIS SE. As a new user, please take the Tour. To be fair, improper topology is the responsibility of the software creating the shapefile, so having incorrect topology is an issue of "undefined behavior" for any other program that comes along. This question asks TWO questions, which violates the "One question per Question" policy. And you seem to want to start a discussion about options to recover from bad topology, and that violates our "Focused question / Best answer" format. Please Edit the question to focus on ONE particular approach, and whatever problem it experiences. – Vince Feb 1 '18 at 1:28
  • It would help if you could catch some suspicious geometries and make a small sample for testing. You could also check the topology with OpenJUMP which makes good reports about the errors that it find. – user30184 Feb 1 '18 at 6:08