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<div>may be the road network is disconnected, so that the algorthim find a node on a edge that as no connection to the whole network.</div>
<div>This is a problem, may be a depth-search-first would help to detected this kind of errors. As far as I know OSRM has no plugin to check the network or?</div>
<div> </div>
<div>Regards</div>
<div> </div>
<div>Carsten</div>
<div>
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<div style="margin:0 0 10px 0;"><b>Gesendet:</b> Dienstag, 29. April 2014 um 12:18 Uhr<br/>
<b>Von:</b> "Emmanuel Bégué" <medusis@gmail.com><br/>
<b>An:</b> "Mailing list to discuss Project OSRM" <osrm-talk@openstreetmap.org><br/>
<b>Betreff:</b> Re: [OSRM-talk] Foot profile</div>
<div name="quoted-content">Thanks for a prompt reply, but how would poor data quality explain the<br/>
fact that two points that are very very near one another result in<br/>
such a different outcome?<br/>
<br/>
Where can I find more information in how to write profiles?<br/>
<br/>
And, in your experience, would a "car" profile that would basically<br/>
accept to take any road, and ignore road directions, be an acceptable<br/>
approximation for a foot profile?<br/>
<br/>
Thanks,<br/>
Regards,<br/>
EB<br/>
<br/>
<br/>
<br/>
On Tue, Apr 29, 2014 at 6:47 PM, Dennis Luxen <info@project-osrm.org> wrote:<br/>
> Salut Emmanuel,<br/>
><br/>
> 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.<br/>
><br/>
> —Dennis<br/>
><br/>
><br/>
> Am 29.04.2014 um 18:29 schrieb Emmanuel Bégué <medusis@gmail.com>:<br/>
><br/>
>> Hello,<br/>
>><br/>
>> Trying to use Project-OSRM for directions by foot, it seems some<br/>
>> points simply don't work, either as start or stop points, whereas<br/>
>> points that are very near, work fine (as well as some points that<br/>
>> shouldn't be reachable because for example they're in the water).<br/>
>><br/>
>> For example the point 48.88368971897955,2.332395315170288 (north of<br/>
>> Paris), used as a start or an end point, always results in 207,<br/>
>> "Cannot find route between points".<br/>
>><br/>
>> But if we use instead 48.88371088449246,2.332277297973633 (a few<br/>
>> meters away) then everything's fine; or if we use the offending point<br/>
>> with a car profile on Project-OSRM demo site: no problem.<br/>
>><br/>
>> No problem either if we begin or end our journey in the middle of a<br/>
>> river: 48.85939286077621,2.331901788711548, so it's clearly not the<br/>
>> case that the destination point is somehow "unreachable" by foot.<br/>
>><br/>
>> I have tried to set the offending point to the nearest node with<br/>
>> "locate" but that didn't help:<br/>
>> locate?48.88368971897955,2.332395315170288 => 48.883674,2.332385<br/>
>> -- but that last point doesn't work any better.<br/>
>><br/>
>> How can I investigate this? (How do we ask Project-OSRM to print more<br/>
>> elaborate error messages?)<br/>
>><br/>
>> I'm using Project-OSRM version before 3.9, the stock "foot.lua"<br/>
>> profile and OSM data for France from Geofabrik.<br/>
>><br/>
>> Thanks for any pointer.<br/>
>><br/>
>> Regards,<br/>
>> EB<br/>
>><br/>
>> _______________________________________________<br/>
>> OSRM-talk mailing list<br/>
>> OSRM-talk@openstreetmap.org<br/>
>> <a href="https://lists.openstreetmap.org/listinfo/osrm-talk" target="_blank">https://lists.openstreetmap.org/listinfo/osrm-talk</a><br/>
><br/>
><br/>
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