Hi Tom Cutting by a line is easy: - add a way with nodes for start and end of the line where it cut's the polygon first and last. - add nodes where that new way intersects the old polygon - split the new way at these nodes - split the old polygon at these nodes - delete the parts of the old polygon that is outside the new one - combine polygon and some of the new ways (parts of the one you drawed initially) where that should be done
If that creates holes, combine the resulting parts as a multipolygon if necessary. Clipping by a new polygon is basically the same - but draw that new polygon first instead of the line, then proceed as described above. As far as I know there is no automatic way to do one of these. regards Peter Am 27.05.2014 20:23, schrieb Tom Gertin: > I don't know if the tagging listserv is the appropriate forum for this > questions, but I can't find a better one. > > I want to try to complete several polygon editing operations using JOSM. > Anybody know if this is possible or how to accomplish these tasks in JOSM > or any other free editor? > > 1. Clip a polygon using another polygon > 2. Cut a polygon using a line > > I already know how to create a hole in a polygon using a polygon and relate > them, thus creating a multi-polygon. > > Thanks! > > Tom G. > > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
