Hi there! > im with Mattias here. > if there is air under the way i tag it as bridge, leaving the ramps out.
That's what I would do, too. > the layer of the way gives you the hint of the existance or not of ramps. That's not what I'd suggest for the usage of the layer tag! > if the way is "layer=0" and the bridge is "layer=1" there is a ramp. A bridge crossing any other way should be always tagged with layer=1 (or higher). In fact, the renderers could easily take "layer=1" as a default for bridges, as they are usually on top of something. > if the way is "layer=0" and the bridge is "layer=0" too > (the crossing way under is "layer=-1", digged) > then the bridge has no ramps. Something with negative layer has to be a tunnel. Bridges are useless if there is a tunnel. Do not tag bridges as "layer=0" just because there are no ramps. The layer tag is to help a renderer put the ways in the right visual order - not to indicate whether or not a way is elevated or not. Do not tag ways as "layer=-1" just because they are below the general earth surface (such as rivers). The effects of the layer tag should be kept as local as possible. > so if we want to give more detail as to describe the ramp, > i would just tag the ramp as "bridge_ramp=yes" > and the airborn part of the way leave it as "bridge=yes" I doubt such details are very useful, and personally I wouldn't tag them. Regards, Sven _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
