[Qgis-user] Removal of overlap geometries within the same layer - merge to largest neighbor polygon

[Andreas Neumann]

Hi,

A friend of mine has a dirty input data set with lots of overlapping 
geometries (within the same layer) and asked me if there is a tool 
within QGIS to automatically remove the overlaps and assign the 
overlapping area to the neighbor polygon with the largest area.

The solution was surprisingly hard to find, although I am pretty sure 
there are multiple combinations of algorithms that would solve the 
problem. Here is the solution I came up with: 
https://github.com/qgis-ch/overlap_removal/tree/main [1]- perhaps you 
have better ideas - more elegant solutions?

Wouldn't it be great if QGIS had a processing tool to solve this overlap 
cleaning within the same layer "out of the box" without having to use a 
graphical model or a more or less complicated sequence of algorithms in 
the processing toolbox? Apparently, ArcGIS has such a tool ...

Saga and GRASS also might have such tools - but I couldn't get the SAGA 
based QGIS plugin "Dissect and dissolve overlaps" 
(https://plugins.qgis.org/plugins/dissect_dissolve_overlaps).

The same problem exists for automatically filling small gaps in the 
polygon data set ...

Andreas



Links:
------
[1] https://github.com/qgis-ch/overlap_removal/tree/main
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