On Tue, 26 May 2020 at 17:28, Arne Johannessen <a...@thaw.de> wrote: > 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? >
I don't think sac_scale should consider trail_visibility. For the most part I see sac_scale as how technical the path is which is independent of how technical the trackpath is. You could have a path that is well marked with guideposts so easy to follow, but might have ropes in place or rungs which make it quite technical. Similarly you could have an easy non-technical path that is just not well marked or well trodden so has bad trail visibility. It's important to be able to tag these two concepts independently. So regardless of what the SAC standard says, in OSM the sac_scale has become the defacto tag for how technical the path is.
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