I guess we have to decide whether culverts or fords are the more common (and explicitly tag the less-common). I'd plump for culverts being significantly more common myself, but that might not be true on a whole-world basis.
Richard On Tue, Dec 15, 2009 at 12:49 PM, Peter Childs <pchi...@bcs.org> wrote: > 2009/12/15 John Smith <deltafoxtrot...@gmail.com>: > > 2009/12/15 Steve Bennett <stevag...@gmail.com>: > >> IMHO, tagging "layer=1 bridge=yes" for a road going over water is an > >> example of a hack, and "tagging for the renderer". The information > >> "bridge=1" is more than enough to render with, so "layer=1" can *only* > >> be interpreted as giving a renderer a crutch. > > > > Without layer information you'd be guessing if the road goes over the > > water or the water goes over the road, or the water and road are at > > the same level. > > > > You could come up with sane defaults, but that's making assumptions > > rather than tagging explicitly so you know beyond a reasonable doubt. > > > > If you have a bridge or a tunnel you don't need a layer tag a bridge > infers it "goes over" a tunnel that it "goes over" > > If there is neither a tunnel, or a bridge and no layer either then it > must be a ford. > > If you mark bridge=yes, layer=1 you are repeating your self. which is > where problems start, see database normalisation. > > Peter. > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk >
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