[OSM-talk] river - stream

Dave F davefoxfac63 at btinternet.com
Mon Jun 8 14:15:38 UTC 2020

Good Lord!
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:
> https://www.openstreetmap.org/way/757824513
> https://fr.wikipedia.org/wiki/Pont_Morand
>     Whether it's a bridge or tunnel is fairly easily defined by
>     determining
>     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
> Cheers
> Martin

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