[Tagging] Definition and usage of Key:mtb:scale:imba?

brad bradhaack at fastmail.com
Thu Apr 23 02:45:04 UTC 2020


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 <bradhaack at fastmail.com 
> <mailto:bradhaack at 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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