> Doable for sure but an awfully bad idea, mapping bays as areas would > mean two features for the same object (coastline polygon and bay area).
Coastline polygon and bay area is not the same object. Yes, part of border is shared - it is nothing wrong. Also it is possible to use for example multipolygons. > Furthermore the outer edge of a bay, i.e. the edge that is not > coastline is usually not well defined and would require an arbitrary > cutoff. Yes, cutoff is unfortunately quite arbitrary. But node placement is completely arbitrary - and lacks important information. 2014-10-26 19:00 GMT+01:00 Christoph Hormann <chris_horm...@gmx.de>: > On Sunday 26 October 2014, Mateusz Konieczny wrote: > > Please, try mapping bays as areas - not as nodes. > > > > It is really rare to see it done this way - but it is doable, see > > http://overpass-turbo.eu/s/5CQ > > Doable for sure but an awfully bad idea, mapping bays as areas would > mean two features for the same object (coastline polygon and bay area). > Furthermore the outer edge of a bay, i.e. the edge that is not > coastline is usually not well defined and would require an arbitrary > cutoff. > > Maintaining bay polygons would be an awful mess, they would end up > frequently being broken. And there is no gain at all in terms of > substantial information in the database compared to nodes (since the > coastline is already mapped and the non-coastline edge is arbitrary). > > The reason you would prefer areas is probably simply that this would > make it easier for to use in rendering - but making life more difficult > for the mapper just to make it easier for the renderer is not a good > idea. Based on the coastlines and the bay nodes you can quite easily > generate approximate bay polygons that can be used for the purpose of > labeling for example (yes, even for the Paulsdorfer Bucht). > > This argument by the way was already made in a slightly different > context in > > https://github.com/gravitystorm/openstreetmap-carto/issues/804 > > -- > Christoph Hormann > http://www.imagico.de/ > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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