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I have the following situation: two layers that I want to intersect. The first layer has polygons over agricultural areas (blue polygons). The second one is the Study area (green polygon). I want to use the "Study area" layer to complete the blank spaces of the first one:

I am trying with intersect but it is not working.

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Edit to reply the answer

I have tried your option but I don't have the expected results. Both layers have the same projectionenter image description here

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Second edit:

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    Check the geometry of the field polygon layers. You may have invalid geometries. You can do that using 'Vector -> Geometry tool -> Check Geometries'
    – ahmadhanb
    Aug 9, 2017 at 13:47
  • It seems I have both invalid and error output. What can I do to solve this?
    – GCGM
    Aug 9, 2017 at 13:53
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    That is another question, and it is difficult to answer it here without knowing what type of invalid geometry do you have. I think it is better to ask another question describing the type of invalid geometry: overlapping polygons, self-intersection, etc. Make it clear to attract more answers. For this question, the solution is using union with valid geometry.
    – ahmadhanb
    Aug 9, 2017 at 13:59
  • Please edit the title of your question to include enough information for future visitors to be able to find this thread when looking for the same problem.
    – underdark
    Feb 9, 2018 at 18:52

2 Answers 2

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You need to use Union tool from Vector -> Geoprocessing tools -> Union.

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Make sure that both layers should have the same projection to work properly. Otherwise, you may have undesirable results.

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  • Hi, thanks for the reply. I just edit the question to show my problem. I am doing the same as you but the output is not correct
    – GCGM
    Aug 9, 2017 at 13:41
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To solve this issue you may use "Union"

Vector > Geoprocessing Tools > Union.

This Link describe better - http://grindgis.com/software/qgis/basic-editing-tools-in-qgis

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  • Hi, thanks for the reply. I just edit the question to show my problem. I am doing the same as you but the output is not correct
    – GCGM
    Aug 9, 2017 at 13:41

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