[GIS] Intersect polygons

intersectionpolygonqgisunion

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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Best Answer

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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