On 29 May 2017 at 13:16, Andreas Wicht <[email protected]> wrote: > On 28 May 2017 at 14:43, James Wood <[email protected]> wrote: >> On the digitizing toolbar, try "Split Parts" instead of "Split Features" on >> multipart polygons. > > Thank you for the hint, James. Somehow I always thought that this > function is only suitable for separating an existing part from a > feature (never used it though). > Yet, if you cut a polygon with the "Split Parts" tool, the output will > be an invalid geometry (I observed self-intersections). This as well > can not be the intended behavior. I could observe those errors in > simple scratch layers as well as in PostGIS layers. > > Has anybody else experienced this behavior?
Is my assumption right, that according to this issue (https://issues.qgis.org/issues/12799) the current workflow would have to look somewhat like this: - use split parts tool to split the multipart polygon - delete the newly created part (-> invalid geometry) using the "Delete Part" tool either - create a new feature/new part (depending on the use case) inside the hole created by deleting the part - optional: attribute merging with other features surrounding the new feature (depends on the complexity of the attribute table) - change desired attribute(s) (which led to the decision to separate the area) or - use the "Reshape Features" tool to enlarge a neighbouring polygon by the cut off area or - create new feature inside the hole and merge it ("Merge Selected Features" tool) to enlarge a neighbouring polygon by the cut off area Isn't that a bit too much post-processing for that cause? Any thoughts? _______________________________________________ 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
