I'm going to change my mind. I don't think mtb:scale:imba should be
deprecated. It should be used instead of mtb:scale because it is
better. The IMBA Trail Difficulty Rating System was designed for all
trails, not just bike park trails or trails with features. It follows
that OSM should use it for all trails too, not just IMBA signed trails,
or bike park trails. I agree with everything that user Opadeira is
proposing and I'll add some comments to the wiki talk page.
On 4/22/20 7:12 PM, Andrew Harvey wrote:
On Thu, 23 Apr 2020 at 03:03, brad <bradha...@fastmail.com
<mailto:bradha...@fastmail.com>> wrote:
I've never seen an official IMBA rating on a sign.
I have,
https://wiki.openstreetmap.org/w/images/9/96/Serrata_Mountain_Bike_Track_Board_Map.jpeg
I see both mtb:scale and mtb:scale:imba both used. The wiki for
mtb:scale doesn't make sense. It's either skewed for extremely
extreme riding or they don't understand gradient. It says that
for mtb:scale=1, gradient<40%. This is meaningless. Nobody can
ride up an unpaved grade that is 40%, or probably even 30%. A
steep trail is 15%. A really steep, almost unrideable, very
difficult hiking, trail is 20%. Going downhill, anything above
25% is a double black, only a small percentage of riders can ride,
unless it is very smooth with really good traction.
I agree, I find it very hard to set mtb:scale confidently based on the
descriptions on the wiki.
In my opinion, mtb:scale:imba could be deprecated, and the wiki
for mtb:scale updated & clarified.
I would disagree on that, mtb:scale:imba is still useful to mark
officially signposted or designated ratings of the track made
according to the IMBA system, like in the first photo I posted.
I'd be very keen to review any improvements to mtb:scale though, I
have very low confidence in all the ones I've tagged so far as I feel
like every time I read the wiki I have a different opinion
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