Hi all,
I have recently been using OSRM to do map-matching for transit vehicles,
with locations from historical GPS data. The documentation on creating
profiles is pretty minimal from what I can tell, so I've just been able
to make a few modifications to the car.lua profile to allow vehicles to
go on streetcar tracks, agency service roads, etc.
The data I've been playing with so far has a ~20second sampling
frequency, which has worked well, but I'm about to start working with
data that has a lower sampling rate (30-60secs) and I'm worried that
I'll get a lot of spurious matches. I was wondering if it is possible to
modify the profile such that a strong preference is given to known
transit routes (which are tagged with route relations in OSM). Transit
almost always follows a known route, but sometimes it detours, and it's
important to my research to be able to capture that in matched GPS data.
What might be a good way to add this to a routing profile? Does
everything in the profile come down to speed, access, and node-related
penalties? Would I want to artificially inflate the "speed" of
transit-served streets? Is there more thorough documentation on profiles
somewhere than what is provided here
<https://github.com/Project-OSRM/osrm-backend/wiki/Profiles>?
The profile I've been using is:
https://github.com/SAUSy-Lab/retro-gtfs/blob/master/etc/ttc.lua
Any help would be greatly appreciated!
--
Nate Wessel
Jack of all trades, Master of Geography
SAUSy Lab <http://sausy.ca>, Sid Smith Hall
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