Hi Paul On the subject of bridges on abandoned railways, they can be mapped if the railway is tagged as abandoned. Its not just old industrial cities, old railway bridges also provide height restrictions 50 years after closier.
Heres an example in rural shropshire http://www.openstreetmap.org/browse/way/151765408 Phil -- Sent from my Nokia N9 On 10/02/2013 22:50 Robin Paulson wrote: i've been thinking about this for a while and it's bugging me, so i'd like to hear what the rest of you think. the way we map bridges at the moment is by adding tags to the road/railway/footpath/etc., something like this: bridge = yes layer = 1 which seems a bit clumsy, and doesn't reflect very well what's happening. the problem shows itself best when there is one bridge with several ways on it, for example this near where i live: http://www.openstreetmap.org/?lat=-36.850112&lon=174.793894&zoom=18&layers=M and this: http://www.openstreetmap.org/?lat=-36.850112&lon=174.793894&zoom=18&layers=M all of these roads/railways go over a single bridge, but from the mapping each appears to have its own separate bridge, that is one bridge per way. i'm sure there are many other examples what i would like to hear feedback on is this: perhaps we change the way we map this, and instead map the bridge and the way as entirely separate entities. so, the bridge could be represented with a rectangle, tagged as follows: man_made = bridge layer = 1 name = Auckland Harbour Bridge the ends of the rectangle would be traced over the ends of the bridge structure. then the ways go over, but they no longer have bridge tags or layer tags applied to them, as they are applied to the bridge instead. it would also allow tagging of the bridge without interfering with tagging of the road which goes over it. the second place this will benefit us is the situation where there are bridges with nothing on them. i'm thinking abandoned rail bridges in the ex-industrial cities of uk, where the rails have been ripped up, leaving nothing to apply the bridge tags too, but there are more than likely other examples. we could maybe apply a similar logic to cuttings, tunnels and similar features so, comments, suggestions, revisions, problems, etc. please? cheers, -- robin http://www.openstreetmap.org/?lat=-36.850112&lon=174.793894&zoom=18&layers=M - Auckland's Free University _______________________________________________ talk mailing list talk@openstreetmap.org http://www.openstreetmap.org/?lat=-36.850112&lon=174.793894&zoom=18&layers=M
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