On Sat, Dec 20, 2008 at 8:50 AM, David Earl <da...@frankieandshadow.com>wrote:
> - the layer tag is tagging for the renderer in 99% of cases with > bridges. In nearly all cases a bridge/tunnel tag says "I am above/below" > automatically and a layer tag should be unnecessary. There are a few > exceptions, but they are very rare: primarily where a bridge crosses > exactly over the top of another bridge, where there are more than two > layers involved (e.g. - and this is the only one I have come across in > 2.5 years mapping - > > http://www.openstreetmap.org/?lat=52.329684&lon=-0.192102&zoom=18&layers=B000FTFTTT > where the A14 crosses the B1514 which in turn crosses the East Coast > Main Line railway all at the same point). Had relations been invented > earlier this case might have been better described using a relation. > I'm guessing you don't map in many heavily urbanized areas then, because around where I live, freeway interchanges with two, there, four, or even more layers are not uncommon, e.g: http://www.openstreetmap.org/?lat=37.32393&lon=-121.8924&zoom=17&layers=B000FTF And here is one nearby that hasn't been tagged with layers yet, and is therefore difficult to visually parse: http://www.openstreetmap.org/?lat=37.33964&lon=-121.85169&zoom=17&layers=B000FTF -Scott -- Scott Atwood Cycle tracks will abound in Utopia. ~H.G. Wells
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