On Sun, Jun 10, 2012 at 08:47:35PM +0100, Pierre Béland wrote: > The principal problem with the relation was that the riverbank polygon has > been broken. I finally corrected St-Laurent-Mtl Relation and issued a few > dirty tiles requests. It now results that the islands are rendered properly. > But you may still notice some problems at various zoom levels. In these > cases, you just have to issue dirty tiles requests.
I took a look at one of the islands and noticed that there are both a coastline and riverbank defining the outline of the island. Does the riverbank way provide any tangible benefit? Personally, I dislike this type of duplication as it more than doubles the chance of problems. We really should have a set of best practices on the wiki for coastlines. Note that coastline includes major waterways, e.g. St. Lawrence River, and the great lakes. > View relation http://www.openstreetmap.org/browse/relation/1775822 > View Changeset http://www.openstreetmap.org/browse/changeset/11858120 > > > I finally found that the polygon was broken at the exit of Riviere des > Prairies. I also fixed the relation Riviere des Prairies C > View relation http://www.openstreetmap.org/browse/relation/1769788 > > I also looked at the various islands and found inconsistancies and missing > islands. I corrected natural=land for natural=coastline and added the islands > wich where not part of the relation. > > It is not easy to validate such a relation with many riverbank sections and > islands (107 members). I may have missed other problems. It would be good > that others validate to assure that everything is ok. > > Be carefull when you edit such relations or ways related to these relations. > If you send your data to the server and the polygon is > broken, a Warning message will be issued. In this case it is important > to fix it otherwise we will encounter rendering problems. > > When you edit such relations and are not sure about how to treat islands, > riverbanks and coastlines relations, please send an email to the list to let > others look at it. > > > Pierre > > > > >________________________________ > > De : Pierre Béland <infosbelas-...@yahoo.fr> > >À : Talk-CA OpenStreetMap <Talk-ca@openstreetmap.org> > >Envoyé le : Vendredi 8 juin 2012 14h25 > >Objet : [Talk-ca] Re : Coastline rendering in Quebec > > > > > >I looked in detail at Boucherville islands and cannot find explanations for > >this rendering problem. There are other islands down the Saint-Laurent river > >and Richelieu river with the same rendering problem. I issued /dirty tiles > >requests but this did not fix the problem. > > > > > >I removed a wetland from the coastline relation. > >wetland http://www.openstreetmap.org/?way=77938080 > >St-Laurent-Mtl Relation http://www.openstreetmap.org/browse/relation/1775822 > > > > > > > >Pierre > > > > > > > >>________________________________ > >> De : Harald Kliems <kli...@gmail.com> > >>À : t...@openstreetmap.org > >>Cc : Talk-CA OpenStreetMap <Talk-ca@openstreetmap.org> > >>Envoyé le : Jeudi 7 juin 2012 8h10 > >>Objet : [Talk-ca] Coastline rendering in Quebec > >> > >>On the talk-ca list there have been a few discussion about problems > >>with "flooded" areas in southern Quebec. The conclusion seems to be > >>that the problems are due to the rendering of the coastline which only > >>gets updated every once in a while. The two > cases are: > >> > >>* http://www.openstreetmap.org/?lat=45.6101&lon=-73.4411&zoom=13&layers=M > >>This problem is comparatively recent. Current data appears to be > >>correct. Problem is visible on zoom>=13 > >> > >>* http://www.openstreetmap.org/?lat=45.342&lon=-74.24&zoom=9&layers=M > >>This one has been around for at least 6 months. Current data appears > >>to be correct. Problem is visible on zoom>=9 > >> > >>We haven't been able to figure out who to contact about these issues. > >>Can anyone point us in the right direction? > >> > >>Thanks, > >>Harald. > >> > _______________________________________________ > Talk-ca mailing list > Talk-ca@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ca -- James (Jay) Treacy tre...@debian.org _______________________________________________ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
