2015-10-05 14:10 GMT+02:00 Christoph Hormann <[email protected]>: > On Monday 05 October 2015, François Lacombe wrote: >> Hi all, >> >> How would you feel about considering waterway=penstock beside of >> waterway=canal, waterway=drain to complete pipeline tagging scheme ? >> > > Not such a good idea - that would be correctly tagged as > man_made=pipeline.
My words may be unclear. What I propose : (man_made=pipeline + substance=water) + waterway=penstock or waterway=penstock + tunnel=yes or... A water carrying pipeline isn't always a penstock. A penstock isn't always a pipeline : sometimes shielded tunnels are directly digged in rock. > > A short tubed section of a regular waterway like below a bridge or dam > can be tagged waterway=* + tunnel=yes, a longer tube should always be > man_made=pipeline. According to you, waterway=drain shouldn't exists ? This is precisely what is mapped here : http://www.openstreetmap.org/way/372743390 waterway=drain may just be a bare tunnel digged in the rock without any pipe, thus man_made=pipeline shouldn't be used. Let's say it's an underground river if anyone is more at ease with it like here : http://images.lesechos.sdv.fr/archives/2010/LesEchos/20755/ECH20755024_1.jpg A pipe may be replaced on purpose instead of a drain... or a shielded penstock digged in the mountain, aren't they ? > > waterway=penstock would also lack any functional distinction that would > normally be encoded in the waterway tag - data users would have no way > to decide how treat such feature. It would just say 'this waterway is > tubed' not what kind of waterway it is (artificial/natural, clean/dirty > water etc.) waterway=canal and waterway=drain don't give those details too : would you be able to say if the water is clean or waste when waterway=canal used ? A penstock isn't a drain, isn't a canal or a river : it's a shielded tube (not always a pipe) carrying water down a mountain to obtain a high pressure flow. What more functional details can we give regarding this definition ? Cheers François _______________________________________________ Tagging mailing list [email protected] https://lists.openstreetmap.org/listinfo/tagging
