[OSM-talk] river - stream
davefoxfac63 at btinternet.com
Mon Jun 8 14:15:38 UTC 2020
That has both tunnel & bridge tags on the same object!
This is not what is being discussed here.
On 08/06/2020 11:10, Martin Koppenhoefer wrote:
> Am Sa., 6. Juni 2020 um 18:02 Uhr schrieb Dave F via talk
> <talk at openstreetmap.org <mailto:talk at openstreetmap.org>>:
> Do you have an example?
> A simple example for a tunnel (here subway) on a bridge would be this:
> Whether it's a bridge or tunnel is fairly easily defined by
> which is taking the load.
> If a tunnel's structure was removed, would whitewater's above it
> collapse? If 'yes' then it's a tunnel.
> what I wrote was that - according to some technical definitions - a
> tunnel must not have something above it, it may be sufficient that it
> is closed and long enough. I am not sure if we share these definitions
> in OSM.
> According to the current wiki, "a tunnel is an underground passage for
> a road or similar." and also: "tunnel=* is used for roads, railway
> line, canals etc that run underground (in tunnel
> <http://en.wikipedia.org/wiki/en:Tunnel>). " This doesn't appear to
> be exhaustive / complete, tunnels could also run underwater, above
> ground and potentially in the future even in space, no?
> Many current underwater tunnels are also "underground", as they are
> often running in a man made structure (embankment like) on the ground
> or below the water body/river in the ground
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