On 09.03.2014 13:21, Richard Z. wrote: > the same conceptual problem exists with pylons where they are shared by two > bridges > or aerial tramways. Actualy every pylon breaks the rule by definition because > it > connects "ground" with layer=0 with something else at a different level. > How do you want to model such cases better? Lifts in buildings?
Typical pylons aren't a problem because the "ground" is not an OSM element that they could share a node with. Pylons shared between more than one bridge are indeed an interesting problem for 3D mapping, but I'm not aware that this is commonly mapped or used by applications yet, so there is still some room for establishing good standard practice. Lifts in buildings don't use layer, they use level. That tag follows different rules than layer. > In practice this rule is broken more often than you would think: Hamburg is > full > of waterways connected with roads on bridges through a tag obstacle. France > is > full of bridges sharing a node with the waterway bellow. I would prefer correcting these errors instead of changing the rule they break. > It may be worth to tag have such a rule restricted for "ways of the same type" > and a short well defined list of exceptions. The rule is also needed for ways of different types, e.g. for ordering a stack of road, railway, and waterway bridges. _______________________________________________ talk mailing list talk@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk
