[OSRM-talk] Small way neglected

[yvecai]

So, whatever small rate I set for piste:difficulty=intermediate, no way 
to get this 92 m way in the 'toute' output (apart if the route starts or 
stops on it).

My guess is an optimization happens somewhere for very small ways, but I 
can't find it.

Yves

On 15.12.21 10:55, yvecai via OSRM-talk wrote:
>
> Actually, as I get way informations from another database, I've 
> already set the way osm IDs as name (local name = way:id() in function 
> WayHandlers.names), so that should already do the trick, but 
> apparently not.
> I've also tried to set weight_precision = 0.1 to avoid rounding to 0, 
> but no result.
>
> Regards,
> Yves
> On 14.12.21 21:37, Daniel Patterson wrote:
>> OSRM isn't designed to provide perfect information along the route 
>> like that - but it can be hacked to get close. When I built out the 
>> elevation profile feature for skitrails.com <http://skitrails.com>, I 
>> used a combination of a DEM in postgis along with the OSRM route 
>> geometry to make the elevation profile, so not directly in OSRM itself.
>>
>> For highlighting tagged difficulty sections, what you could try us 
>> using `piste:difficulty` as part of the `name` attribute in OSRM - it 
>> _should_ emit a new step for each new name along the path, so if 
>> difficulty changes, you'd get a new step at that point.
>>
>> You would need to remove the appended `piste:difficulty` tag from any 
>> name you wanted to display on screen later on though.
>>
>> daniel
>>
>> On Tue, Dec 14, 2021 at 10:40 AM Yves <ycai at mailbox.org 
>> <mailto:ycai at mailbox.org>> wrote:
>>
>>     Yes, exactly, I'm playing with OSRM to eventually replace the
>>     routing backend at opensnowmap.org <http://opensnowmap.org>
>>     This feature provides the user a topo highlighting the various
>>     difficulties along the route.
>>     Yves - Opensnowmap
>>
>>     Le 14 décembre 2021 19:13:55 GMT+01:00, Daniel Patterson
>>     <daniel at mapbox.com <mailto:daniel at mapbox.com>> a écrit :
>>
>>         Yves,
>>
>>           I would say that OSRM's step-by-step instructions are
>>         definitely not optimized for nordic ski trails.  The route
>>         _geometry_ will be correct, but the steps are primarily
>>         designed to look at road class (highway=) and names - none of
>>         the piste: tags are considered when generating steps.
>>
>>           What does the optimal output look like in your opinion?  As
>>         a long-time nordic ski racer myself, if I even bothered to
>>         use navigation, I'd mostly only be interested in locations
>>         where there were intersections.  Are you looking to analyze
>>         the various difficulty ratings along the selected route?
>>
>>         daniel
>>
>>         On Tue, Dec 14, 2021 at 10:04 AM Yves via OSRM-talk
>>         <osrm-talk at openstreetmap.org
>>         <mailto:osrm-talk at openstreetmap.org>> wrote:
>>
>>             Hello,
>>             Playing around with OSRM, I figured that smaller ways
>>             seems to be coalesced with others to form a single 'step'
>>             in the output.
>>             I can't find any parameter in the Lua config to change
>>             this behaviour (yet).
>>             Any hint is appreciated.
>>             The use case is a short nordic skiing way with a
>>             different piste:difficulty along a much longer route.
>>             www.openstreetmap.org/way/103175249
>>             <http://www.openstreetmap.org/way/103175249>
>>             Regards,
>>             Yves
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>
>
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