[Qgis-user] Adjusting polygon points to boundary

Oisin oisin.kelly.wild at gmail.com
Thu Feb 26 09:49:31 PST 2026


The method depends on whether the red boundary is a line or polygon and on 
the same or a different layer. 
  
  
  
  
  If red boundary is a polygon go to  the Snapping toolbar and choose 
'Avoid overlap '. In Snapping Advanced configuration set the layer to which 
avoid overlaps applies to the layers the red boundary and brown polygon 
exists on. Then on the brown polygon layer draw a new shape deliberately 
overlapping the red boundary and existing brown polygon. The new polygon 
will be trimmed to the 'avoid overlap ' boundaries. Then merge the new 
brown polygon into the target brown polygon. 
  
  
  
  
  If red boundary is a line. Set avoid overlap to brown polygon layer. Draw 
polygon deliberately overlapping again. Then in  the Processing Toolbox 
under "Vector Overlay" use the "Split with lines" tool. 
  
  
  
  
  
  
  
  Or you could use automatic tracing...but can be difficult to use in my 
experience. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  


  
  
  Hello, 
  
I wanted to ask if there is a tool that allows me to adjust the points of 
the brown area to match the red boundary. Unfortunately, there are a lot of 
points, and doing it manually is no longer feasible. The brown area also 
contains many attributes that I would
  like to keep unchanged. 
  
Does anyone have an alternative approach or a better workflow for this? 
    
  Many thanks in advance, 
  
Jakob Rabanser
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