[OSRM-talk] OSRM match service for public transportation

[Nate Wessel]

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
>
>
>
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