I have two layers (1 and 2) and I want to overlap them and the intersection and the union didn't work.

I want to get something like this:

enter image description here

Is it really easy or is there a special method to follow ?

I am working with QGIS.

  • 1
    In what way did Intersection and Union not work? Can you edit your question to include details of how you used these? – Midavalo Mar 18 '17 at 21:58
  • 1
    Are both layers Vector layers? – Midavalo Mar 18 '17 at 21:58
  • There are both vector layers. I did both Union and Intersection without any special settings and I got the same error as they did here: gis.stackexchange.com/questions/204505/… . I have to go to sleep it's too late here, see you tomorrow and thanks for answering. – Loïc Poncin Mar 18 '17 at 22:13
  • Please edit your question to include any additional information or clarification. – Midavalo Mar 18 '17 at 22:23

First use 'Symetrical Difference' instead of 'Intersection' in the Geoprocessing toolbox and then in a second step do 'Union'.
enter image description here The yellow triangle in 2. is spatially in the same location as in 1. yet I didn't knew how to illustrate it in a better way. I hope you get what I mean.
That should do the same thing and didn't raised any errors for me (QGIS 2.18.0 on MacOS 10.11.6)

  • Using "Symmetrical difference", I had elements without geometry left in the table. I recommend using "difference" in order to get rid of those. – Kantan Aug 15 '17 at 17:09

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