On Fri, Feb 1, 2013 at 5:22 PM, Martin Vonwald (imagic) <imagic....@gmail.com> wrote: We have a spatial database so if all features are within a closed way there is no need for a relation. Why is there a different reasoning for a bridge?
Btw, is this actually true? Does the OSM API actually provide functions to determine whether objects are within a way? And for renderers working from local copies of the database, is it actually to perform this calculation? My impression is that it's much much easier to implement a relation look up (if "bridge" in x.relations.types...) than a spatial look up (if x inside way with type "bridge"). I could be wrong, but I just wanted to check your assumption here. If it's *possible* to do a spatial lookup, but more *difficult*, then that's an argument in favour of relations rather than an implicit spatial relationship. Steve _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
