[Tagging] Rivers classification

[Daniel Koć]

W dniu 08.08.2017 o 16:24, Bryan Housel pisze:
> “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 for others.

Of course I wouldn't use all the data from here, but for example we use 
similar field "population" for tuning rendering place names:

https://github.com/gravitystorm/openstreetmap-carto/blob/a7bb1e14389f491475c0c59929a33cff92f6b3bb/placenames.mss#L67

BTW - distance is already defined as optional tag for waterway relation, 
it's just not mentioned for waterway=river:

https://wiki.openstreetmap.org/wiki/Relation:waterway#Tags

-- 
"Like a halo in reverse" [M. Gore]