I have a map consisting various district. How can I estimate the length of the common boundary shared by any two corresponding districts/polygons in QGIS?
For example if a polygon "A" shares a common boundary with polygons, "B", "C" and "D". Then what would be the length of the boundary between polygon "A-B", "A-C" and "A-D"?
I have calculated the neighboring polygon using the following in field calculator
aggregate( layer:='file_districts', aggregate:=' concatenate', expression:= DIST_ID, concatenator:=', ', filter:=touches($geometry, geometry(@parent)) )
Now i want to estimate the length of each of the neighbor polygon.