you could 1. convert your sea to Multilinestring 2. explode that 3. convert the isles needed to Polygon again
..ede On 10/5/2020 13:18, Rahkonen Jukka (MML) wrote: > Hi, > > What if I would like to convert all the many holes in the sea polygon into > islands? We have a tool in OJ that does something similar with inner rings by > removing them (Remove holes and Remove small holes functions). What I am > after is to select the inner rings of selected features and copy them into a > new layer as outer rings. The simple tool could discard attributes but an > advanced one could optionally copy at least the ID of the source polygon. > Maybe also a "hole_id" could be generated for enabling unique values > "main_id"+"hole_id". > > I know that I can make a polygon as large as the sea and compute the > difference but sometimes it could be more convenient for users just to select > and run "extract holes as polygons". Also, copying the inner rings vertex by > vertex should be a fast and robust method. If some ring would make an invalid > polygon it could skipped with a warning. With difference it could mean that > the whole process fails. > > -Jukka Rahkonen- > > > > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
