Thanks Benjamin,
I think this idea should work well as I am looking to snap GPS points on
the road line. I will definitely give a try on both of the suggested tools.
Thank you for your help
__________________________________________
Advani Chintan Sanjeev
Research Scholar,
Civil Engineering and Build Environment,
Queensland University of Technology,
Brisbane-4000, Australia.
On Wed, Jun 5, 2019 at 12:00 AM Benjamin Krepp <[log in to unmask]> wrote:
> Dear Advani et al,
>
>
>
> Forgive me if I'm missing something, but it sounds as though the basic
> thing you're trying to do is to "snap" points (the GPS points for vehicle
> locations) to lines (a road network.)
>
> It's no great surprise that you're finding that the vehicle location GPS
> points don’t precisely align with the road network. GPS data is inherently
> "noisy" and needs to be cleaned before being used. "Snapping" is one such
> kind of cleaning.
>
>
>
> If you're using ArcMap, you'll find a tool called "Snap" in the "Editing
> Toolbox" under "Arc Toolbox" that performs this operation.
>
> If you're using QGIS, there is a "Snap Points to Lines" tool under the
> "SAGA Tools" in the "Processing" Toolbox which should perform the same kind
> of operation.
>
>
>
> One closing note: Even after snapping, your data may require further
> cleaning – perhaps manual editing/cleaning. Be sure to *examine* the
> results of the snapping operation! As mentioned above, GPS data is
> inherently “noisy.” Consequently, you may find that some points snapped to
> a *different* route than the one you expected because they were
> sufficiently “off” to be closer to another route than the one you
> expected. These will need to either be discarded or manually snapped you
> the route you had in mind – if you can figure out where the relevant point
> might be. Sometimes GPS point data is simply sufficiently “off” that
> individual data points have to be discarded.
>
>
>
> Hope this helps.
>
> Best regards,
>
> Ben
>
>
>
> *Benjamin Krepp* | Chief GIS Programmer/Analyst
>
> CENTRAL TRANSPORTATION PLANNING STAFF
>
> 857.702.3670 | *[log in to unmask] <[log in to unmask]>*
>
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>
>
> [image: email_logos_2015]
>
>
>
>
>
> -----Original Message-----
> From: Northeast Arc Users Group [mailto:[log in to unmask]] On
> Behalf Of Chris Duncan, GISmatters
> Sent: Tuesday, June 4, 2019 8:58 AM
> To: [log in to unmask]
> Subject: Re: Develop path using coordinates in GIS
>
>
>
> Maybe others with more experience will come to your rescue, but I am not
>
> aware of any tool that will automagically recognize "incorrect" points
>
> and fix them... how could the tool possibly discriminate b/n good and
>
> bad points? I think your only options are:
>
> * manually detect these glitches (either before or after route-matching)
>
> and edit the source points (e.g., interactively in your GIS) to move bad
>
> points onto what you believe is the correct route
>
> * create a reduced street network for OSRM -- if you know the trips of
>
> interest followed certain routes, you can select just those routes
>
> (e.g., select by road class) and save to a new network and feed that
>
> reduced network to OSRM
>
>
>
> As for converting point sequences into lines, there are tools for that:
>
>
>
> QGIS: Points2One plugin (install as needed), among other options
>
> ArcGIS data management toolbox PointsToLine
>
>
>
> These tools let you optionally create separate routes for groups of
>
> points based on some attribute field of the point data, and optionally
>
> control the order in which the points are sorted to create the line.
>
>
>
> Chris
>
>
>
>
>
> On 6/3/19 10:49 PM, Chintan Advani wrote:
>
> > 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?
>
> >
>
> > large scale network.PNG
>
> > 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] <mailto:[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%7Ccec29f75b1e34d7047ff08d6e948bee9%7C17f1a87e2a254eaab9df9d439034b080%7C0%7C0%7C636952895987769951&sdata=JwDzbSgmuWB1MhkW%2F3orc4hGNR6K%2FUhMSYNsY0Mn%2BxM%3D&reserved=0
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>
> >
>
> > 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%7Ccec29f75b1e34d7047ff08d6e948bee9%7C17f1a87e2a254eaab9df9d439034b080%7C0%7C0%7C636952895987779946&sdata=G33cwVc6vj3BJfhc%2BpKNsdq4zmBpt%2FD8oJrv%2BCSLfqw%3D&reserved=0
> <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%7Ccec29f75b1e34d7047ff08d6e948bee9%7C17f1a87e2a254eaab9df9d439034b080%7C0%7C0%7C636952895987779946&sdata=G33cwVc6vj3BJfhc%2BpKNsdq4zmBpt%2FD8oJrv%2BCSLfqw%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] <mailto:[log in to unmask]>
>
> >
>
> >
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>
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>
> > Fax: +1 413.658.0346
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> >
>
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> --
>
>
>
> Chris Duncan, Ph.D.
>
> President, GISmatters
>
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