[OSRM-talk] Strange results from map matching

Frederik Ramm frederik at remote.org
Thu Dec 10 10:50:37 UTC 2020


sorry for that blast from the past. My mailbox played a trick on me and
I thought this was a current message!


On 10.12.20 11:49, Frederik Ramm wrote:
> Hi,
> On 13.05.20 23:14, Sasan Amini wrote:
>> I am relatively new in using OSRM for map matching. I got my first
>> results but there are two issues that I can't understand. My data has
>> 130 rows (points) and in return, I get 150 points! 
> I think you are approaching this with the wrong expectation.
> The map matching algorithm is not one that simply moves each of your
> input points onto the output geometry and therefore has one output for
> every input.
> Instead, the map matching algorithm tries to answer the question: What
> is a valid route on the routing graph that is most likely the basis of
> this input GPS track?
> This "most likely valid route" is then returned to you. It can have more
> or fewer points than the input geometry; in fact matching input geometry
> points to certain points on the output will be very difficult!
> Bye
> Frederik

Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"

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