[...] but also human-added clues such as trail blazes, poles and cairns.
[...]
The key is not about route visibility (how easy it is to choose the right trail at a trail junction) and quality of trail marking. See [trailblazed:visibility](https://wiki.openstreetmap.org/wiki/Key:trailblazed:visibility)=* for attributes regarding trail marking quality.
Huh?? the key isn’t about markers, like trail blazes, poles, and cairns, but is about clues like trail blazes, poles and cairns?
The usage “route visibility” is still weird to me. Even in Europe “route” is used to refer to low/no visibility paths, see the Austrian system, or the OMS wiki page describing climbing routes.
www.austria. info/en/active-outdoors/summer/walking-hiking/signposting-difficulty-levels-hiking-climbing
wiki.openstreetmap. org/wiki/Climbing#Climbing_Routes
(I can’t post more than 3 links, and can’t post another reply, so remove spaces above)
“Alpine routes:
These are not hiking trails – they lead into alpine or high alpine terrain, and can contain sections that jut out, pose a risk of falling, or are unsecured.”
Using the word route doesn’t automatically refer to the relationship of paths.
Routing, or route relationships, or navigation between paths would be clearer IMO.
The different between ground and landscape for path visibility also seem a little unclear to me. A level or slightly sunken surface I would just think of as the ground.
Something like:
The key trail_visibility=* is used as part of a classification scheme for hiking trails and paths. The key describes how easy it is to follow a mapped trail using all available visual aspects of a path. These aspects include the visibility of the path on the ground (differences in surface of the trail vs. the surface next to it, differences in vegetation, a leveled or concave path surface, a treeless corridor through a forest, etc.) as well as human-added markers such as trail blazes, poles and cairns.
It is based on the classification of the Swiss Alpine Club (SAC).
The key is not about routing visibility (how easy it is to choose the right trail at a trail junction), as that is covered by guideposts.
If a path does have markers they should be indicated in via trailblazed. See trailblazed:visibility=* for specific attributes regarding trail marking quality.