To me, it seems that the root of the problem is that the mtb:scale:uphill=* key is flawed.

Instead, these keys should be name mtb:scale:forward=* and mtb:scale:backward=* . This would make everything unambiguous.

And, of course, an additional incline=up/down would be optional but very helpful. One could for example easily infer a mtb:scale:uphill/downhill from this combination (if still of interest for some reason). (+obvious other advantages for routing)



On 26/09/2022 14:40, Brad Haack wrote:
Any good cycling router needs to use a digital elevation model in it's algorithm, or use elevation tied to the paths somehow (such as with a gpx track).   These odd OSM tags are a sideshow.


On 9/26/22 03:16, Mateusz Konieczny via Tagging wrote:



26 wrz 2022, 09:02 od o...@tobias-knerr.de:

    On 26.09.22 02:21 Mateusz Konieczny wrote:

        But what can be done in cases where there is no real incline but
        path goes through series of up and down hops?


    I would intuitively prefer if you put the information about the
    presence of "hops" into a specialized tag instead of making the
    value space of an established and approved key more messy.

    Leave incline=* to describe the overall incline of the way in that
    case. That is: Do you end up lower or higher than you were in the
    start?

In this case I am thinking about something
that overall has tiny elevation change.

What would you propose as such extra tag?

up_and_down=yes

(not really happy about it, but right now I
have no better idea)?

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