Le 11/07/2019 à 10:42, André Siefken a écrit :
Thx Frédéric for the immediate reply, and sorry for me to take my time
to respond.
I will rewrite the profiles to test general soft restrictions, however
my idea here is to have a profile that e.g. strictly uses distance
between possible matched waypoints to get the overall match.
Yes, you can active the distance as objective in the profile
https://github.com/Project-OSRM/osrm-backend/blob/master/profiles/car.lua#L19
How would the matching behave if I'd remove all road type based
restrictions (e.g. vehicle type allowed or not, speed limit, oneways)?
To have soft restriction you must keep it with high weight.
You can set this restricted road type into classes on profile, to select
them dynamically on request
See
exclude {class}[,{class}] Additive list of classes to avoid,
order does not matter.
in
https://github.com/Project-OSRM/osrm-backend/blob/master/docs/http.md#general-options
I do see where the algorithm needs certain base variables from the
network to estimate a likely route, though, and do have problems seeing
if this is feasonable at all, and I do ask instead of trying because it
will take me some time to get familiar with profile changes...
André
On 7/9/19 10:14 PM, Frédéric Rodrigo wrote:
Le 09/07/2019 à 22:03, André Siefken a écrit :
Hi @all,
I'm exploring ways to have the matching algorithm work agnostic to
(most) road restrictions and rather 'trust' the trace I pass in.
I receive continuous GPS locations, with moderate to high resolution in
time, from bikes as well as cabs or buses. It just so happens that some
idiots ride their bikes on roads that OSM (and most laws) thinks they
shouldn't, as well as some cars ignoring bus lane restrictions or buses
leave their lanes. In those cases, matching fails one way or another
([No match], or only partial matches).
I have a hard time wrapping my head around if a profile can actually
fullfill restriction and/or even vehicle type (I can easily work with
multiple graphs, though) agnostic matching, which likely implies a
similar agnostic weighting. I imagine a shortest connection/path
matching should do just that, but then I'm at a loss if that is actually
the case and if so, how to generate such a profile.
Your insights would be much appreciated...
André
I think the weighting is the right think to do. Use high weight on way
there is no legal access. It's some kind of soft access restriction.
You can even weight the opposite of a one way restriction.
But you will have to rework all the samples profiles provided in OSRM.
Frédéric.
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