Hi Nate and thank you very much for your help. I have a very basic question about your ttc profile (sorry if it's too silly). When you match a GPS dataset against this profile instance, will it return a subway route for example? If yes, why this subway route would be declared much plausible by osrm than the street route? Only because of the ttc profile? I realize that I don't understand very well the involved mechanisms behind osrm and profiles, if you can shed some light on this, I would greatly appreciate. Another question: I suppose that the subway data has to be included in the osm data of my city (Montreal) in order to get subway routes from match . How can I know if it's there or not in my osm data? Thank you again Nate, Patrick
2018-04-26 9:36 GMT-04:00 Nate Wessel <[email protected]>: > I've had some success with transit matching by simply modifying the car > profile to allow routing on streetcar tracks, allowing access for buses and > public service vehicles, etc. Here's a profile I'm using for transit now: > > https://github.com/SAUSy-Lab/retro-gtfs/blob/master/etc/ttc.lua#L347 > > I had also tried to develop a more transit specific profile from the > ground up. My thought was that known transit routes (provided in the OSM > data) would be preferred by modifying their edge weights. This however ran > into an issue with the matching service which hasn't been resolved yet; > edge weights simply aren't used in match results. > https://github.com/Project-OSRM/osrm-backend/issues/4785 > > If anyone has a suggestion for the question about multimodal paths, I > would be very keen to hear it, however I suspect this is still an open > topic of research with no definite best practices. > > Best, > Nate Wessel > Jack of all trades, Master of Geography, PhD Candidate in Urban Planning > SAUSy Lab <http://sausy.ca>, Sid Smith Hall, University of Toronto > > On 04/26/2018 09:01 AM, Patrick Agin wrote: > > Dear all, > > I'm a newbie to routing engines and my first attempts are with OSRM. > Specifically I want to use the *match *service. Questions I have is : > > 1) is it possible with match service to specify public transport (e.g. > subway) as the mode of transportation? I see only profiles for car, bike > and foot. If not, is there a solution? I'm pretty sure it it possible but > how? I saw in some profiles the public_transport parameter but I don't know > how to use it. > > 2) is it possible for match to return a multi-modal path given the > timestamps of each coordinate? For example, return a sub-path that is the > most plausible for pedestrian (chosen because of the low speed inferred > from timestamps) followed by another subpath that is the most plausible for > car (because of a higher speed)? Or is the only solution to pre-process the > data to infer by myself the mode of transportation and make subsequent > calls to the corresponding profile instance? > > Thanks a lot, > > Patrick > > > _______________________________________________ > OSRM-talk mailing > [email protected]https://lists.openstreetmap.org/listinfo/osrm-talk > > > > _______________________________________________ > OSRM-talk mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/osrm-talk > >
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