On Mon, Dec 14, 2009 at 10:36 PM, John Smith <deltafoxtrot...@gmail.com>wrote:
> 2009/12/15 Steve Bennett <stevag...@gmail.com>: > > On Tue, Dec 15, 2009 at 1:31 PM, Anthony <o...@inbox.org> wrote: > >> In a park is a ditch. There is a very small bridge going over the > ditch. > >> I've tagged the ditch with barrier=ditch. Should the ditch be layer=-1? > >> Even though the park is layer=0? > > > > Layers are only there to explain the relative heights of things when > > they meet. No harm will result from marking the ditch as layer -1. > > Whether or not it needs to be a lower number than that of the bridge > > is an unresolved question. > > I tend to mark bridges as layer=1 and anything at ground level I don't > set a layer tag, which seems the most logical to me since ditches > aren't under the ground etc. > I tend to agree with you, but: http://wiki.openstreetmap.org/wiki/Image:IMG_6783.JPG Are both of those bridges layer=1? At least the road one, and arguably both, are effectively at "ground level". Right now I have the ditch with no layer tag (this way it acts as a barrier to travel through the park at layer=0). But it doesn't feel right putting the bridges at layer=1. So I've used barrier=entrance for the node where the way and the ditch cross. For the part going under the road, I have barrier=ditch, tunnel=yes. Which, I don't know, is the part I like the least. But the ditch isn't really a ditch at the time it goes under the road. It's more of a drain pipe. Is there a tag for drain pipe? (I'll check the wiki right after I hit send).
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