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I have two polygon layers. As seen in picture, the border of two layers do not fit. I want to align the border of layer 1 (blue) to overlap the border of layers 2 (pink). How to do it with QGIS?

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One way to do this is to copy the feature from the pink layer to the blue layer. If you're looking into a more elaborate method, you could do the following:

  1. Intersect the 2 layers. Vector > Geoprocessing tools > Intersection
  2. Calculate the difference between the 2 layers: Vector > Geoprocessing tools > Difference
  3. Union the intersection and the difference: Vector > Geoprocessing tools > Union
  4. Merge the features using Union from the advanced digitising toolbar.

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