deleteoverlapping-featuresqgisqgis-processing
Here is what I'd like to achieve in QGIS.
Is there a processing tool to remove the overlapping part of polygons?
It is also very important that they do not get merged during the process and that they keep their original attributes since I need to work with them afterwards.
I would tend to agree that a script is needed.. however, in theory one could intersect everything, keeping the ID attribute of every parent polygon. Then each fragments "parentage" and thus any combination of parents could be established through queries.
This is basically a vector version of the raster approach. Given the potential problems with sliver polygons, likely limits in vector topology precision and area calculation, not to mention processing time, I would not discount the raster version. If a sufficient resolution were feasible the final precision might not be much worse - or would atleast be more easily assessed.
EXPERIMENT:
I generated random number in range 1,2,3 in non-overlapping polygon feature class
and labelled them by this number:
I created the copy of original and appended it accordingly by selection from original to create identical polygons. Add spatial join:
RESULT:
I hope this is what you are after.
NOTE: this does not dissolve identical polygons, it only calculates their count. Search this forum on how to dissolve them and keep count. One of the possibilities is calculating value str(centre.X)+str(centre.Y) and dissolving using this field.
Best Answer
You can use the 'Check Geometries' plugin (Vector/Geometry Tools/Check Geometries) to remove overlapping areas.