A few questions: 1. What is the “elevation” tag supposed to mean? It is not in the wiki and the use count is pretty small [1].
2. Why level=-3? I seems like that would be dependent on what other underground features were being mapped. 3. Why status=abandoned | active? Wouldn’t the lifecycle prefix be a better fit? —Tod [1] https://taginfo.openstreetmap.org/keys/elevation#values > On Jun 21, 2020, at 3:05 PM, Joseph Guillaume <josephguilla...@gmail.com> > wrote: > > Hi all, > > I've been in touch with the person who's mapped a lot of the > waterway=canal+man_made=canal, and they didn't have any specific rationale. > > After seeing the proposal page, their preferred tagging is: > > canal=qanat > elevation=-3 > layer=-3 > location=underground > name=Bir.1.2 > status=abandoned or active > tunnel=flooded > waterway=canal > > I'm not sure how to check how many other people have been mapping > man_made=qanat, but as someone who's mapped a lot of canal=qanat, I'm happy > to proceed with that as a new de facto. > > I'm happy to still go to a vote if Jeisenbe would like, but I don't > personally feel comfortable mapping either man_made=qanat (too generic, > doesn't fit with waterways) or historic=aqueduct+aqueduct=qanat (visions of > Roman aqueducts don't sit well with me in this case - only some qanats are of > historic value). > > Thanks for the interesting discussion, > > JoeG > > > > On Sun., 21 Jun. 2020, 4:44 am Joseph Eisenberg, <joseph.eisenb...@gmail.com > <mailto:joseph.eisenb...@gmail.com>> wrote: > > Most existing uses of man_made=qanat by the way are in combination with > > waterway=canal. > > Thank you for mentioning this. There are only 5 ways with man_made=qanat, > without waterway=* - https://overpass-turbo.eu/s/Viq > <https://overpass-turbo.eu/s/Viq> > > I will update the proposal page with this information. > > So there is no debate about whether or not to tag these features with > waterway=canal. > > We are deciding whether or not the additional tag should be man_made=qanat or > canal=qanat. > > Since waterway=canal is currently used for all kinds of irrigation canals and > aqueducts, it makes sense to consider these irrigation features to be a type > of canal. > > I have previously considered whether or not it might be sensible to create a > whole new value of waterway=* for aqueducts and irrigation canals, but that > does not seem to solve any particular problems: irrigation canals can be as > narrow as 20 cm or as wide as 20 meters, as can aqueducts used for drinking > water, so tagging usage=irrigation and width=*, while using the existing main > tag, is probably reasonable. > > – Joseph Eisenberg > > On Sat, Jun 20, 2020 at 5:17 AM Christoph Hormann <o...@imagico.de > <mailto:o...@imagico.de>> wrote: > > I think this is a good idea. Both in the sense of establishing a distinct > tagging for it that does not engross qanats with other types of underground > waterways and in the sense of using a non-English and non-European term where > the most descriptive and clear term comes from a non-European language. We > have other cases of such tags in OSM but still in a proposal process which is > dominantly discussed in English this is rare and kind of a litmus test for > how culturally diverse tagging in OSM can be and if the cultural geography of > non-European regions can be mapped in the classifications used locally just > as we are used to doing it in Europe and North America. > > Most existing uses of man_made=qanat by the way are in combination with > waterway=canal. > > -- > Christoph Hormann > http://www.imagico.de/ <http://www.imagico.de/> > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org <mailto:Tagging@openstreetmap.org> > https://lists.openstreetmap.org/listinfo/tagging > <https://lists.openstreetmap.org/listinfo/tagging> > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org <mailto:Tagging@openstreetmap.org> > https://lists.openstreetmap.org/listinfo/tagging > <https://lists.openstreetmap.org/listinfo/tagging> > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging
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