On Sat, May 23, 2020 at 9:11 PM Tod Fitch <[email protected]> wrote: > > Being a Sierra Club member in California, it seems to me that the Yosemite > Decimal System (YDS) [1], originally created by the Sierra Club is made to > order for this. Classes 1 through 3 are basically hiking, 4 is transitional > and 5 is technical climbing. My understanding having been exposed to this for > decades is slightly different from that in Wikipedia mine are: > > 1 - No special gear or equipment needed. If not the equivalent to a city > sideway in difficulty, it is very close. > 2 - Uneven, loose or other surfaces where good hiking shoes are advisable. > 3 - You may occasionally need to use a hand to steady yourself in difficult > areas. > 4 - Climbing or scrambling but low exposure and/or low risk of injury such > that safety equipment like ropes are not required. > 5 - Climbing requiring technical skills and equipment. > > Class 5 was divided into 10 levels (thus a “decimal” system) but has been > expanded to well more than 10 sub levels over the years as techniques and > gear have evolved. But that is off topic when dealing with hiking trails. I > think for most of what I’d map as a trail we are dealing with classes 1 > through 3. In Kevin’s example system, the trail with a toddler would be a 1 > and the other two examples would be either 3 or 4.
There are a couple of moves on the second trail that are a technical difficulty of about 5.4, but the exposed stuff isn't that difficult and the technical stuff isn't exposed - so class 4 is about right. Except that the very existence of class 4 is controversial: https://www.summitpost.org/class-four-is-a-myth-problems-in-yds/891794 The third trail is similar difficulty to the second in summer. At the time that the picture was taken, I'd call it an M1 - there's a different classification for-mixed-ice-and-rock. The guidebook says that trail is hikable from mid-May to mid-October and we were climbing in December in that pic. We switched a couple of times between snowshoes and crampons, and brought out the ice axes at least once or twice. On Sat, May 23, 2020 at 9:05 PM Andrew Harvey <[email protected]> wrote: > https://youtu.be/VKsD1qBpVYc?t=533 I would tag as > sac_scale=demanding_mountain_hiking, my rule of thumb is anything where the > average person would need to use their hands to get over an obstacle is > demanding_mountain_hiking. This is what the wiki says too "exposed sites may > be secured with ropes or chains, possible need to use hands for balance". That's how I'd scale it if I hadn't been scolded for over-grading it. (The person who scolded me also argued that "need to use hands to get ahead" for class 4 was a poor translation, and that it would better read "need to take full body weight on hands".) I actually simply accepted the scolding and 'forgot' to retag it, so it's still demanding_mountain_hiking in OSM. One of the guidebooks reads. "the rock is sound, holds are plentiful and route-finding is straightforward. Nevertheless, the exposure is dramatic, and less confident parties may wish to employ a rope" - which sounds like textbook class-4 if such a thing exists. -- 73 de ke9tv/2, Kevin _______________________________________________ Tagging mailing list [email protected] https://lists.openstreetmap.org/listinfo/tagging
