RFC: hiking_visibility key 🍿 paired with hiking_technique and hiking_exposure/fall_risk this rounds out the hiking path trinity

[erutan]

I took a break from OSM to enjoy the mountains and got swamped with client work.

@Hungerburg

Still trying to make sense of the “classifying mountain path” video of our local club:

• a trail marked black means: trust the holds
• a trail marked alpine route: test the holds

I think that’d probably just go under hiking_technique=scrambling to indicate that holds are necessary. That key is meant to be used with local systems (SAC, YDS, BMC, CAI) where people can add more information that is used in local areas.

So something in the US could get hiking_technique=scrambling and yds_scale=4, in Switzerland hiking_technique=scrambling and sac_scale=5, in this case it could be hiking_technique=scrambling and austria_scale=black.

While I think there’s value in having terrain stability as another axis, it’s probably a bit complex for OSM. I’ve played with adding values to YDS on another axis - loose, collapsing, skidding/sliding etc.