Hi! In the last days the OpenStreetMap Carto Style 4.0 is being deployed on the OSMF tile servers. This new version of the style doesn't take old-style multipolygons (where the tags are on the outer ways instead of on the relation) into account any more. In a huge effort in the last months we have converted all old-style multipolygons to the modern tagging, so this is a good step!
Unfortunately, as a side-effect of this change, many multipolygon relations now appear wrong on the map. This is the case for multipolygon relations that have the same tags on the relation as well as on (some of the) outer or inner ways. This is *wrong* tagging, and needs to be fixed. (Note that this always was wrong tagging, even before we deprecated old-style multipolygons, but the way the software worked with old-style multipolygons, this problem was not visible on the map. But now it is.) Here is an example: http://www.openstreetmap.org/relation/1330741 . As you can see (unless somebody fixes this :-) the clearing in the forest that should just have grass, also has tree symbols on it. In many other cases it is not this obvious, there are just islands in a river missing or so. There are about 50,000 cases like this worldwide, forests, waterways, all sorts of areas. But the worst problem is in Canada. There are about 15,000 affected relations, most from the CanVec imports. First, we have to make sure that there are no further imports of broken data. I hope the people who have done those imports (and might still continue) are here on this mailing list. If not please make them aware of this issue and/or put me in touch with them. Second, somebody needs to clean up the broken data, either automatically or manually. 99% of the data has not been changed since the import, so it might be feasible to do an automatic cleanup, but somebody has to do this. Otherwise we'll have to do a manual cleanup, through tools such as Maproulette and the OSM Inspector. I am currently in the process of creating Maproulette challenges for other areas of the planet, but will not do this for Canada at this time. Lets discuss this here first. I can provide OSM data extracts, statistics, etc. if somebody wants to look at the data. All of this is part of a larger effort to fix areas in OSM. See http://area.jochentopf.com/ for more information. There is also a thread on the talk mailinglist at https://lists.openstreetmap.org/pipermail/talk/2017-June/078203.html and this issue https://github.com/osmlab/fixing-polygons-in-osm/issues/36 . News of the effort are posted regularly to https://github.com/osmlab/fixing-polygons-in-osm/issues/15 . Jochen -- Jochen Topf joc...@remote.org https://www.jochentopf.com/ +49-351-31778688 _______________________________________________ Talk-ca mailing list Talk-ca@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ca