On Thu, Nov 12, 2020 at 6:22 PM Adam Franco <adamfra...@gmail.com> wrote:
> > - origination:natural=beavers > > Thanks for remembering this one. Around here, beavers are a significant sculpting force on the landscape. (And `man_made=dam` is the best tagging that we have for their water control structures, which are also often adjusted seasonally) Very long story short, I think we might be able to worry a little less > about what the body of still water *is* and more about its other > properties that might be of interest. In programming languages this is > referred to as "duck typing <https://en.wikipedia.org/wiki/Duck_typing>". > If ducks could type, I could easily imagine that a pond might be mapped and the tags entered by a duck typing. I think that the duck in question might be Atwood's Duck. https://en.wikipedia.org/wiki/Law_of_triviality#Related_principles_and_formulations And ... having seen this argument several times before, I basically avoid `water=*` when mapping. I can hardly think of any waterbody, intermediate on the large..small and natural..artificial scales between the Great Lakes and a farmer's stock pond, where the `water=*` value would be uncontroversial. `natural=water` renders, and I'll try to avoid taking a census of the angels dancing on that particular pinhead. This whole discussion reminds me of one time that someone who wasn't from around here (nor a native speaker) was insisting that anything that was called a 'creek' in English *must* be a tiny watercourse. Not around here! The creek in question was, if memory serves, either the Schoharie Creek, shown in this picture: http://minerva.union.edu/garverj/mohawk/images/schoharie_falls.jpg or else the West Canada Creek https://en.wikipedia.org/wiki/West_Canada_Creek#/media/File:Aug_2011_Ft_Noble_Mtn.JPG I'm comfortable with `waterway=river` on any waterway where I map the riverbank. On Thu, Nov 12, 2020 at 2:52 PM Paul Allen <pla16...@gmail.com> wrote: > >> On Thu, 12 Nov 2020 at 19:30, Joseph Eisenberg < >> joseph.eisenb...@gmail.com> wrote: >> >>> Re: is water=* tag needed? >>> >> >> >>> But since water=pond is not clearly defined as natura/semi-natural vs >>> man-made, we have a large number of features where the water=* tag is not >>> providing this information. Since the previous tagging system clearly >>> distinguished natural from man-made water bodies, this would be a loss for >>> database quality. >>> >> >> We often do not know if it is natural or artificial. Maybe it's a natural >> depression in the ground that fills with water. Maybe it was created >> by man as a water feature. Maybe it's an old quarry that has flooded. >> Even if it was originally a result of something like quarrying it may have >> happened so long ago that there are no records. >> >> What we can determine (at least in principle) is if it meets criteria >> for a lake (large size or large waves or has aphotic zones) or a >> pond. In principle, a suitably-qualified mapper could investigate >> those things on site. We can accept using guesswork based on >> size pending fuller investigation. A lake/pond distinction is >> useful irrespective of whether it is entirely natural or entirely >> artificial. >> >> Determining if it's entirely natural, or deliberately man-made, or >> an unintended consequence of past human activity is harder. >> Possible for retention basins that are still in use. Mostly >> possible for reservoirs, although some reservoirs are >> based around natural lakes. But historical records are >> incomplete (and some mappers insist we should never >> ever make use of historical data to inform our mapping). >> >> Maybe we need an artificial=yes/no. >> >> -- >> Paul >> >> _______________________________________________ >> Tagging mailing list >> Tagging@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/tagging >> > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > -- 73 de ke9tv/2, Kevin
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