The problem that canvec has is multi polygons with different attributes were stacked on top of eachother(i.e. hole in the forest that is also a lake? That makes 2 polygons with same shape stacked one of top of eachother... marshland+water+hole in forest? 3 polygons etc etc. Not that I wouldnt live it fixed, but as someone that has "fixed" canvec data before dropping it in, It's a massive undertaking and really complexe/abstract thing to do.
On Jun 30, 2017 3:54 AM, "Jochen Topf" <joc...@remote.org> wrote: Hi! A week ago I wrote this email and nobody answered it yet. Does that mean that nobody feels responsible for the import that created this data and nobody here cares for this data? I see three ways forward: * We do nothing. The broken data stays in OSM. Not a good solution, because every user of the data has to work around this or handle the complaints. * The Canadian community steps up and fixes the data, automatically or manually. * We ask the Data Working Group to remove the broken import. Jochen On Thu, Jun 22, 2017 at 11:38:15AM +0200, Jochen Topf wrote: > Date: Thu, 22 Jun 2017 11:38:15 +0200 > From: Jochen Topf <joc...@remote.org> > To: talk-ca@openstreetmap.org > Subject: [Talk-ca] Multipolygon problems > > 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 -- 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
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