2009/8/8 Roy Wallace <waldo000...@gmail.com>: > Forget about the renderer for a second. IMHO we should tag what is on > the ground. As the wiki says, layer is "used to mark if a > way/node/area is above or under another one", where "is above or > under" clearly refers to the physical reality. It's not *physically* > possible to have something on layer=0 connected at a T-junction to > something on layer=1 - or at least,
you will have this situation on all ways with layers: they are somewhere connected to another way on a different layer. Forget about the T-junctions for a moment: a simple way with a bridge will have layer=1 on the bridge, thus the way with layer=0 (before the bridge) is connected to the way with layer=1 where the bridge begins and ends. It's always like this. Therefore the convention is: if objects on different layers share a node, then they are connected at that node. > Alternatively, perhaps you are suggesting the layer=* tag should be > used only to tell the renderer which ways to display on top of other > ways? Not just the renderer. It's a way to model the (relative) spacial situation into our generally 2D-Database. > If so, I don't like this because it's clearly tagging for the > renderer. no, it's not, it's about relative order in the db. cheers, Martin _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
