On 06/04/2016 09:12 PM, Harald Kliems wrote: All these discussions are the reason why I almost never touch the highway=* tag and rather add surface=* or other descriptive tags to TIGER roads. There just isn't any consensus and many good reasons for many positions about residential, unclassified, track, etc.
I go farther than that. I try to avoid adding subjective tagging entirely. I'll add surface=, because I can tell asphalt from clay. But tracktype=, smoothness=, mtb:scale=, sac_scale=, are all things I tend to avoid. Two mappers are likely to come up with different answers, which flies in the face of the http://wiki.openstreetmap.org/wiki/Verifiability principle. And the consequences are unlikely to be severe; subtle differences in rendering, or tweaks in time estimates from a router, are all that I really expect. I find that there's an element of machismo in the assignment of the scales. SAC scale is a really good example. Novices are likely to overrate a route, because they lack confidence and also don't have the experience of harder routes to compare against. Experienced mountaineers are likely to underrate them. Someone who routinely free-solos a route that's 5.6 on the Yosemite scale doesn't know what a grade 4 route is! About the only people who can grade a route reliably are experienced guides, who have an idea what to expect of clients at various skill levels - and the description of the grades has to be written in terms of, "what would you take a client on," or they'll still underrate them. I've seen trails with the steepness and exposure of https://www.flickr.com/photos/65793193@N00/3183604309/ and https://www.flickr.com/photos/65793193@N00/3183604743/ tagged as anything from sac_scale=hiking (T1) to sac_scale=alpine_hiking (T4). If subjectivity allows for that wide a range of classifications, the scale isn't all that useful. _______________________________________________ Talk-us mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk-us
