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]
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