W dniu 06.08.2017 o 23:19, Richard pisze:

The width is fine for many small rivers where mapping riverbanks would be
a nonsense and should be respected by the renderer.
But what you ask for seems like tagging for the renderer. Most of the
information is already there, either river width or the geometry determined
by riverbanks.

Using classification is not tagging for the renderer, because it's not cheating that it's something different - it's just simplifying and sorting.

It's a useful generalization, just like having different types of roads as a general property. Highways of course have width too and you can also draw the geometry with area:highway=*, but that's a different thing. On the macro scale you don't want all the details, only general data.

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

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