Hi Chris,
Thank you for your response. You got it right that I am using point
samples of a vehicle's travel to estimate the most likely path it actually
followed along a road network. I have tried using ORSM tools earlier. The
path would have been accurate if my co-ordinates were exactly on the road
network. However, the data set that I have posses, has the co-ordinates
that are slightly away from the road network at several locations. The
figure attached with the mail shows the stated problem. The vehicle should
have taken a straight path as can be seen that it follows a straight
route. However, the two co-ordinates in the paths are drifted away from the
road network that leads to an unrealistic movement for the vehicle. Hence,
I need some tool that can adjust such drifted co-ordinates ( probably
through some technique) as well as draw a path between all such points in a
similar fashion as the existing ORSM tool does. And, in case there is no
such tool that can do both, can you please suggest some method to overcome
the problem?
[image: large scale network.PNG]
[image: issue with ORSM.PNG]
Thanks and Regards,
__________________________________________
Advani Chintan Sanjeev
Research Scholar,
Civil Engineering and Build Environment,
Queensland University of Technology,
Brisbane-4000, Australia.
On Tue, Jun 4, 2019 at 12:15 PM Chris Duncan, GISmatters <
[log in to unmask]> wrote:
> Can you describe a bit more precisely what you wish to do? It sounds
> like perhaps you have point samples of a vehicle's travel and you want
> to estimate from those the most likely path it actually followed along a
> road network? If that's your aim, you need to familiarize yourself with
> the challenges and rewards of route-matching, e.g. using OSRM:
>
> https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fproject-osrm.org%2F&data=02%7C01%7CNEARC-L%40listserv.uconn.edu%7C0d0dba959c71475851eb08d6e8975a99%7C17f1a87e2a254eaab9df9d439034b080%7C0%7C1%7C636952134112564177&sdata=CxLYkOW5CUuoY1tnCQMfgeonKi5Qs3yGCP7F4SXAD5U%3D&reserved=0
>
> It's been a few years since I worked with this stuff, but I think the
> general approach is still reasonably well presented in this paper by
> some of the early researchers:
>
> https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ismll.uni-hildesheim.de%2Flehre%2FsemSpatial-10s%2Fscript%2F6.pdf&data=02%7C01%7CNEARC-L%40listserv.uconn.edu%7C0d0dba959c71475851eb08d6e8975a99%7C17f1a87e2a254eaab9df9d439034b080%7C0%7C1%7C636952134112564177&sdata=bo5FgwwYDxR4yMzjzG7YIYeepvHmg%2BliJLAhW7ddox0%3D&reserved=0
>
> You don't have to master that material to use OSRM, but it's good to
> understand some of the challenges involved in what is a more or less
> constrained estimation (educated-guessing) problem whose success depends
> on the quality (density, accuracy, and precision) of your point data.
>
> If you have some other goal in mind, please try to clarify.
>
> Chris
>
> On 6/3/19 9:55 PM, Chintan Advani wrote:
> > Hi guys,
> >
> > I am looking for some tools in ARCGIS/ QGIS that can help me to plot the
> > trajectories using the lat/long coordinates for different vehicles. It
> > would be great if someone can suggest some inbuilt tools as I am new to
> > this these software and need some guidance. I even tried to install a
> > map-matching python script based tools from some online source but
> > facing issues during execution. I can even share the sample data if that
> > can be helpful.
> >
> > Thank you in anticipation.
> >
> > __________________________________________
> > Advani Chintan Sanjeev
> > Research Scholar,
> > Civil Engineering and Build Environment,
> > Queensland University of Technology,
> > Brisbane-4000, Australia.
> >
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> --
>
> Chris Duncan, Ph.D.
> President, GISmatters
> [log in to unmask]
>
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