[OSRM-talk] Small way neglected

[Yves]

Hello Rolland,
I was slowly approaching this conclusion reading the compression code, thanks for the speed-up!
Regards,
Yves 

Le 17 décembre 2021 10:25:38 GMT+01:00, Roland Swingler <roland at beeline.co> a écrit :
>Not 100% sure what you're trying to do, but I've had a similar problem in
>that I have wanted to get the route extracted from OSRM with no compression
>at all - i.e. I don't want guidance instructions, I want every single
>node/way as it appears in OSM data). To do this, I had to hack
>https://github.com/Project-OSRM/osrm-backend/blob/master/include/engine/api/route_api.hpp#L957-L960,
>removing (or making conditional) the first and last lines of this block
>collapseTurnInstructions and suppressShortNameSegmenets (If you follow
>through the code and read what those functions are doing, you'll see that
>they're removing things that are shorter than a certain length and
>otherwise trying to make the turn instructions sensible for human
>consumption).
>
>HTH
>Roland
>
>On Thu, 16 Dec 2021 at 20:01, yvecai via OSRM-talk <
>osrm-talk at openstreetmap.org> wrote:
>
>> 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, 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> wrote:
>>
>>> Yes, exactly, I'm playing with OSRM to eventually replace the routing
>>> backend at 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> 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> 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
>>>>> Regards,
>>>>> Yves
>>>>> _______________________________________________
>>>>> OSRM-talk mailing list
>>>>> OSRM-talk at openstreetmap.org
>>>>> https://lists.openstreetmap.org/listinfo/osrm-talk
>>>>>
>>>>
>>
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