Hi Luigi, I think you can proceed this way: - using the "Polygons to lines" tool, convert your the polygon layer (building.shp) to lines
- using the "Merge vector layers" tool, merge your line layer (line.shp) and the layer generated by the previous step - using the "Polygonize" tool, create a new polygon layer from the layer generate by the previous step As a side note, it seems to me that the reference system of your layers is wrong: it is set as geographic 4326:WGS84 but the coordinates of the vertices are clearly in meters and not in degrees, so it should be a projected coordinate system like an UTM one. -- Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-User-f4125267.html _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user