2010/1/5 Ture Pålsson <[email protected]>: > How should I map a staircase connecting a bridge to a street below? My > initial thought was to approximate it with a vertical way with > highway=steps, but is it even possible to have a vertical way? I.e,
It isn't really. I'd use a single, short highway=steps way, if one endpoint of it has layer=0 (or none) and the other has layer=1 then it's implied that it's in some way vertical. For all the use cases I can think of (in routing), the single way is good enough. > can you have two nodes at the same lat/lon but with different layers? Yes, but only by the means of layer= tag. It makes editing harder when there are overlapping nodes, but I guess in some situations that's the only way to map something. > (Do nodes even have layers?) Or should I try to map the actual > zigzagging/spiralling of the steps? But that, too, leaves me with the > question of how to map things that project on the same spot on the > ground. It's possible, but not very useful, I'd just "cheat" as you called it. I'd love to see OpenStreetMap go into the third dimension (perhaps as a separate project) building the map or model of the world like it is actually, but I've been thinking a little about it and I'm happy nodes only have a lat and lon right now. If nodes or objects had elevations and/org heights you'd actually have to put some number in there whenever you draw node, and 99% of the times I map an object I don't know it's altitude, nor height. We'd end up with the most inaccurate map db ever made. Cheers _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
