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] > <mailto:[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] <mailto:[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] <mailto:[email protected]> > https://lists.openstreetmap.org/listinfo/tagging > > > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging
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