[OSRM-talk] Foot profile

Emmanuel Bégué medusis at gmail.com
Tue Apr 29 17:18:34 UTC 2014


Thanks for a prompt reply, but how would poor data quality explain the
fact that two points that are very very near one another result in
such a different outcome?

Where can I find more information in how to write profiles?

And, in your experience, would a "car" profile that would basically
accept to take any road, and ignore road directions, be an acceptable
approximation for a foot profile?

Thanks,
Regards,
EB



On Tue, Apr 29, 2014 at 6:47 PM, Dennis Luxen <info at project-osrm.org> wrote:
> Salut Emmanuel,
>
> the foot profile is the least maintained. And foot data is among the most inconsistent tagged data in OSM. You routing data probably broke into many, many unconnected pieces.
>
> —Dennis
>
>
> Am 29.04.2014 um 18:29 schrieb Emmanuel Bégué <medusis at gmail.com>:
>
>> Hello,
>>
>> Trying to use Project-OSRM for directions by foot, it seems some
>> points simply don't work, either as start or stop points, whereas
>> points that are very near, work fine (as well as some points that
>> shouldn't be reachable because for example they're in the water).
>>
>> For example the point 48.88368971897955,2.332395315170288 (north of
>> Paris), used as a start or an end point, always results in 207,
>> "Cannot find route between points".
>>
>> But if we use instead 48.88371088449246,2.332277297973633 (a few
>> meters away) then everything's fine; or if we use the offending point
>> with a car profile on Project-OSRM demo site: no problem.
>>
>> No problem either if we begin or end our journey in the middle of a
>> river: 48.85939286077621,2.331901788711548, so it's clearly not the
>> case that the destination point is somehow "unreachable" by foot.
>>
>> I have tried to set the offending point to the nearest node with
>> "locate" but that didn't help:
>>    locate?48.88368971897955,2.332395315170288 => 48.883674,2.332385
>> -- but that last point doesn't work any better.
>>
>> How can I investigate this? (How do we ask Project-OSRM to print more
>> elaborate error messages?)
>>
>> I'm using Project-OSRM version before 3.9, the stock "foot.lua"
>> profile and OSM data for France from Geofabrik.
>>
>> Thanks for any pointer.
>>
>> Regards,
>> EB
>>
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>
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