How do you use QGIS to remove portions of polygons that overlap in the same layer?












2















Is there a way to easily eliminate the overlapping portions of polygons in the same layer?



For example, I want to turn this
enter image description here



into this



enter image description here



I used Union to break the polygons apart where they overlapped, and then used Delete Duplicate Geometries to get rid of half the overlaps, but still had to manually delete the others. That's fine for the example, but won't work with the large amount of polygons that will be in the real data. Is there a better way to do this?






qgis







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  • Thank you for including "before" and "after" images of what you're trying to achieve. It made your question easy to understand.

    – csk
    5 hours ago
















2















Is there a way to easily eliminate the overlapping portions of polygons in the same layer?



For example, I want to turn this
enter image description here



into this



enter image description here



I used Union to break the polygons apart where they overlapped, and then used Delete Duplicate Geometries to get rid of half the overlaps, but still had to manually delete the others. That's fine for the example, but won't work with the large amount of polygons that will be in the real data. Is there a better way to do this?






qgis







share|improve this question









New contributor




Chad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





















  • Thank you for including "before" and "after" images of what you're trying to achieve. It made your question easy to understand.

    – csk
    5 hours ago














2












2








2








Is there a way to easily eliminate the overlapping portions of polygons in the same layer?



For example, I want to turn this
enter image description here



into this



enter image description here



I used Union to break the polygons apart where they overlapped, and then used Delete Duplicate Geometries to get rid of half the overlaps, but still had to manually delete the others. That's fine for the example, but won't work with the large amount of polygons that will be in the real data. Is there a better way to do this?






qgis







share|improve this question









New contributor




Chad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












Is there a way to easily eliminate the overlapping portions of polygons in the same layer?



For example, I want to turn this
enter image description here



into this



enter image description here



I used Union to break the polygons apart where they overlapped, and then used Delete Duplicate Geometries to get rid of half the overlaps, but still had to manually delete the others. That's fine for the example, but won't work with the large amount of polygons that will be in the real data. Is there a better way to do this?






qgis




qgis






share|improve this question









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Chad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









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Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 5 hours ago









csk

7,577833




7,577833






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asked 5 hours ago









ChadChad

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Chad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Chad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.













  • Thank you for including "before" and "after" images of what you're trying to achieve. It made your question easy to understand.

    – csk
    5 hours ago



















  • Thank you for including "before" and "after" images of what you're trying to achieve. It made your question easy to understand.

    – csk
    5 hours ago

















Thank you for including "before" and "after" images of what you're trying to achieve. It made your question easy to understand.

– csk
5 hours ago





Thank you for including "before" and "after" images of what you're trying to achieve. It made your question easy to understand.

– csk
5 hours ago










2 Answers
2






active

oldest

votes


















2














Use the Symmetrical Difference tool.



enter image description here




Symmetrical difference



This algorithm extracts the portions of features from both the Input and Overlay layers that do not overlap. Overlapping areas between the two layers are removed. The attribute table of the Symmetrical Difference layer contains original attributes from both the Input and Difference layers.







share|improve this answer
























  • Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.

    – Chad
    3 hours ago



















2














QGIS Processing Toolbox has a SAGA Polygon self-intersection tool (under SAGA | Vector polygon tools).



It works much like QIGS Union Tool, while this tool retains only one feature per the overlapped area.



Open the attribute table of generated Intersection layer and select Delete all features whose fid (or id) is 0.



enter image description here






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    2 Answers
    2






    active

    oldest

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    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    2














    Use the Symmetrical Difference tool.



    enter image description here




    Symmetrical difference



    This algorithm extracts the portions of features from both the Input and Overlay layers that do not overlap. Overlapping areas between the two layers are removed. The attribute table of the Symmetrical Difference layer contains original attributes from both the Input and Difference layers.







    share|improve this answer
























    • Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.

      – Chad
      3 hours ago
















    2














    Use the Symmetrical Difference tool.



    enter image description here




    Symmetrical difference



    This algorithm extracts the portions of features from both the Input and Overlay layers that do not overlap. Overlapping areas between the two layers are removed. The attribute table of the Symmetrical Difference layer contains original attributes from both the Input and Difference layers.







    share|improve this answer
























    • Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.

      – Chad
      3 hours ago














    2












    2








    2







    Use the Symmetrical Difference tool.



    enter image description here




    Symmetrical difference



    This algorithm extracts the portions of features from both the Input and Overlay layers that do not overlap. Overlapping areas between the two layers are removed. The attribute table of the Symmetrical Difference layer contains original attributes from both the Input and Difference layers.







    share|improve this answer













    Use the Symmetrical Difference tool.



    enter image description here




    Symmetrical difference



    This algorithm extracts the portions of features from both the Input and Overlay layers that do not overlap. Overlapping areas between the two layers are removed. The attribute table of the Symmetrical Difference layer contains original attributes from both the Input and Difference layers.








    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered 5 hours ago









    cskcsk

    7,577833




    7,577833













    • Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.

      – Chad
      3 hours ago



















    • Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.

      – Chad
      3 hours ago

















    Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.

    – Chad
    3 hours ago





    Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.

    – Chad
    3 hours ago













    2














    QGIS Processing Toolbox has a SAGA Polygon self-intersection tool (under SAGA | Vector polygon tools).



    It works much like QIGS Union Tool, while this tool retains only one feature per the overlapped area.



    Open the attribute table of generated Intersection layer and select Delete all features whose fid (or id) is 0.



    enter image description here






    share|improve this answer






























      2














      QGIS Processing Toolbox has a SAGA Polygon self-intersection tool (under SAGA | Vector polygon tools).



      It works much like QIGS Union Tool, while this tool retains only one feature per the overlapped area.



      Open the attribute table of generated Intersection layer and select Delete all features whose fid (or id) is 0.



      enter image description here






      share|improve this answer




























        2












        2








        2







        QGIS Processing Toolbox has a SAGA Polygon self-intersection tool (under SAGA | Vector polygon tools).



        It works much like QIGS Union Tool, while this tool retains only one feature per the overlapped area.



        Open the attribute table of generated Intersection layer and select Delete all features whose fid (or id) is 0.



        enter image description here






        share|improve this answer















        QGIS Processing Toolbox has a SAGA Polygon self-intersection tool (under SAGA | Vector polygon tools).



        It works much like QIGS Union Tool, while this tool retains only one feature per the overlapped area.



        Open the attribute table of generated Intersection layer and select Delete all features whose fid (or id) is 0.



        enter image description here







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited 55 mins ago

























        answered 1 hour ago









        KazuhitoKazuhito

        14.9k31677




        14.9k31677






















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