Kevin Kenny <kevin.b.ke...@gmail.com> wrote:
> 
> I took the liberty of revising the English translation in
> https://wiki.openstreetmap.org/wiki/Key:sac_scale#Values to something
> that I hope will be more helpful to English speakers.

Overall, this seems like an improvement to me.

However, I note that the translation on the wiki mentions trail markings 
several times, while the original German SAC text doesn't really mention 
markings at all. Instead, SAC mentions trail visibility several times. In OSM 
terms, the following is roughly true:

T1 ~ trail_visibility=excellent
T2 ~ trail_visibility=good
T3 ~ trail_visibility=intermediate
T4 ~ trail_visibility=bad
T5 ~ trail_visibility=horrible
T6 ~ trail_visibility=no

Note that both T1 and trail_visibility=excellent can be achieved without any 
markings whatsoever. I think it would be best to remove the mention of trail 
markings in favour of links to trail_visibility.

Alas, I haven't found a good way to express this on the wiki.

Also, some T4+ trails out there have excellent visibility and some trails that 
are otherwise T1 have horrible or no visibility.

The SAC scale does consider trail visibility. But should sac_scale=* consider 
it as well, and if so, to what extent?


> [...]
> 
> Let me reiterate that the subkey that's needed is actually the one
> that asserts 'this IS what one would expect of an urban or suburban
> footway', rather than 'this is a relatively unimproved "natural"
> trail'.

Right.


-- 
Arne Johannessen
<https://wiki.openstreetmap.org/wiki/User:Arne_Johannessen>


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