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I have a shapefile containing 6 classes of polygons on QGis 3.14. Some of these polygons overlap each others, but they're not geometry errors or duplicates, just polygons with different attributes. However I need to have maximum one entity at any place. So, I'd like to obtain, for each overlapping area, a new entity containing the attributes of the polygons that overlap. I can't make an intersection on a single layer, and the union tool gives me two polygons with equal geometries.

What should I do ?

PolyGeo
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HeelRom
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1 Answers1

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In QGIS 3, I can suggest paying attention to the SAGA's tool Polygon Self-Intersection that is placed in Processing > Toolbox under SAGA > Vector Polygon tools > Polygon self-intersection.

saga

Check also @Kazuhito's answers in this article How to sum up values of overlapping polygons in QGIS?.

Maybe one day @xunilk will translate his article in English.

References:

Taras
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    Actually, @Kazuhito's answer using the aggregate tool with the geometry group-by function is perfect, after an union or even a spatial joint ! While the self intersection polygon tool deletes the other field's entries in intersecting feature's attribute tables. Thank you ;) – HeelRom Jul 01 '20 at 14:54