[OSRM-talk] Foot profile
mitch at roadtrippers.com
Tue Apr 29 17:24:52 UTC 2014
Is there a way we could use the foot profile to generate a set of broken routes we can feed into MapRoulette?
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mitch at roadtrippers.com
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On Apr 29, 2014, at 1:18 PM, Emmanuel Bégué <medusis at gmail.com> wrote:
> 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?
> 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.
>> Am 29.04.2014 um 18:29 schrieb Emmanuel Bégué <medusis at gmail.com>:
>>> 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.
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>>> OSRM-talk at openstreetmap.org
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