“official_length" is actually a good example of something that really does not need to be tagged in OSM, and could instead be looked up if the river has a wikidata tag. See https://www.wikidata.org/wiki/Q3392 <https://www.wikidata.org/wiki/Q3392> for others.
Bryan > On Aug 8, 2017, at 10:01 AM, Richard <ricoz....@gmail.com> wrote: > > On Tue, Aug 08, 2017 at 03:20:31PM +0200, Daniel Koć wrote: >> W dniu 08.08.2017 o 12:07, Daniel Koć pisze: >>> I've just found that length=* tag is quite closely connected to waterways >>> (almost 72% uses): >>> >>> https://taginfo.openstreetmap.org/keys/length#combinations >>> >>> Taginfo does not show such combination with rivers (it probably omits >>> anything <1000 uses), but it's 446 lines already: >>> >>> http://overpass-turbo.eu/s/qS7 >> >> Looks like a "distance" tag is better than "length" when it comes to long >> objects like rivers, so I would recommend it in waterway Wiki pages instead. >> We have 915 such uses with waterways: > > I know that you want save some computing power but nothing should be easier > to compute than the length so encouraging mappers to add their own estimates > doesn't seem like the best idea. The 915 uses possibly have a special purpose? > > However if there is something like "official_length" of a river (for example > mentioned in wikipedia) that could be certainly tagged. > > Other tags that might help are those relating to ships. > > Richard > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging
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