Hi Volker, Le dim. 22 mars 2020 à 18:35, Volker Schmidt <vosc...@gmail.com> a écrit :
> Slippery terrain. In the sense of definitions. > > Concerning the tunnel=flooded wiki page: > > The symbol shows free flowing water (air above the surface), wherea the > first example is for a headrace where "no air can get inside" Why is this > situation not tagged as pipeline? (see last row in this table > <https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dpipeline#Usage)>?) > The point of the symbol is to show water in the whole tunnel section, independently of flowing regime. To me a tunnel is different from a pipeline in regard of structure and building technique. Both tunnels and pipelines could have usage=headrace or usage=transmision https://wiki.openstreetmap.org/wiki/Proposed_features/Hydropower_water_supplies#Headraces_tunnels_and_canals > The page states: > ... tunnel <https://wiki.openstreetmap.org/wiki/Key:tunnel>=yes > <https://wiki.openstreetmap.org/wiki/Tag:tunnel%3Dyes> where a path is > usually intended for human to safely pass and where water level is usally > controlled for safety reasons " > I don't find areference to this implied meaning of tunnel=yes > Many, if not the majority of the UK Inland Waterways canals have no > towpath. > Then tunnel=flooded is more appropriate This distinction has been determined to introduce tunnel=flooded. https://wiki.openstreetmap.org/wiki/Proposed_features/Hydropower_water_supplies#Human_accessibility.2C_pipelines_vs_tunnels > Other comments on the key "tunnel", referring to taginfo "tunnel=" > <https://taginfo.openstreetmap.org/search?q=tunnel%3D>: > > Absence of "tunnel= *" means: "this way is not in a tunnel of any type" > "tunnel=yes" on a way means: "this way is in a tunnel of some type" > > It looks as if tunnel:type > <https://taginfo.openstreetmap.org/keys/tunnel%3Atype> is practially not > used > We use instead tunnel= * > <https://taginfo.openstreetmap.org/search?q=tunnel%3D> to indicate the > type of tunnel. > :type suffix doesn't bring any additional information, indeed. > This tagging is unfortunate, but in line with the (original) bridge > approach > tunnel=culvert is the most frequent value: 1208667 uses > tunnel=flooded is rare in comparison; 2060 uses > > There is also 3337 instances of tunnel=covered, which, at least in Italy > (140) seem mainly tagging errors > +1 Fully disposed to make any improvement to wiki according to those points. All the best François
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