> > it is wrongly named (distance instead of length) Has already been corrected (at least in the english wiki)
> it can assume multiple different values according to different sources "length:source" can resolve this if needed. > it is unverifiable "on the ground" it is IMNSHO useless (*just point to a Wikipedia article to get this > information*) Let me ask you a question please: how do you verify "name:es" of a river which flows in France? Should we delete all "name:<lang>" tags and direct users to wikipedia instead? For that I guess a better solution would be to use the fixme=* tag: > "fixme: check that this river length is between 5499 and 7088 Km", for the > Nile. This would mean keeping fixme=* tag in every waterway relation forever which contradicts its purpose. Cheers, Eugene вс, 17 февр. 2019 г. в 16:36, Sergio Manzi <[email protected]>: > I think I know understand what usage you want to do of that "waterway > length" datum (*or at least that's what I'm reading in your last message*): > use it as a "control" for checking if the waterway's segments add up to the > "official" (*whatever that can mean...*) waterway length. Or at least in > part: that datum will be close to useless to check waterways with the > complexity of the "*river of a hundred waterways*" and many similar ones. > > For that I guess a better solution would be to use the fixme=* tag: > "fixme: check that this river length is between 5499 and 7088 Km", for the > Nile. > > TBH I see A LOT of issues with this tag: > > - it is wrongly named (*distance instead of length*) > - it is unverifiable "on the ground" > - it can assume multiple different values according to different > sources > - it is IMNSHO useless (*just point to a Wikipedia article to get this > information*) > > Personally I'm leaning to propse to deprecate the usage of this key and > subject that to a vote. What is the process for that? > > Sergio > > > On 2019-02-17 14:07, Eugene Podshivalov wrote: > > вс, 17 февр. 2019 г. в 15:18, Sergio Manzi <[email protected]>: >> >> That's as old as data processing: "*garbage in, garbage out*". Let's >> fix the data. > > Fixing data is a good thing but from utilization in production point of > view the choice between unstable and stable data is not questioned. > Competeness of data is even more important than its stability, and that > unfortunately cannot be achieved that quickly. One can create a waterway > relation with a length defined and then there may be a long run until all > waterway segments are drawn properly to finally be able to compare it to an > official length. > > You'll probably can find many different estimations about its length. >> Which one are you going to choose? > > I would take one from any encyclopedia (subject to its license) and that > figure will at least serve other mappers as a guidence when searching for > incomplete or broken rivers. > > Cheers, > Eugene > > > вс, 17 февр. 2019 г. в 15:18, Sergio Manzi <[email protected]>: > >> On 2019-02-17 12:55, Eugene Podshivalov wrote: >> >> >> It will work but only if the entire river from its spring to mouth is >> drawn precisely enough, all relation roles are labeled properly and nobody >> breaks the labeling by intent or mistake some day. >> >> That's as old as data processing: "*garbage in, garbage out*". Let's fix >> the data. >> >> And yes, the river you pointed at is particularly complex and probably >> geographers are pulling each other's hairs about computing its length. >> You'll probably can find many different estimations about its length. Which >> one are you going to choose? >> >> Sergio >> _______________________________________________ >> Tagging mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/tagging >> > > _______________________________________________ > Tagging mailing > [email protected]https://lists.openstreetmap.org/listinfo/tagging > > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging >
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