Sounds like you want to split A and merge the smaller of the resulting areas into B. There should be a bunch of tutorials on digitizing online if you look around, or you can check the QGIS Documentation [1]
If you have already digitized the new boundary as a line feature you can use processing tools to split the boundary areas with the line features, but you will still have to merge in an edit session with the digitizing tools. https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html?highlight=digitizing%20merge#merge-selected-features On Sat, 19 Jun 2021, 00:33 Pat Brown, <[email protected]> wrote: > I currently have two adjoining polygons, A and B. Their common boundary is > the green line. The map from which this was digitised has changed and the > border now lies along the red line. In other words the boundary, instead of > ending at the X point must end at the Y point. How can I do this without > having to redigitise the section of the outer boundary between the X and Y > points? I do realise that I will have to redigitise the boundary along the > red line as its shape has changed. Thanks > > [image: image.png] > > > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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