Re: [sumo-user] Demand generation using OD matrix

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

Hello,

we have had some good experiences with loading trips directly into sumo in our own projects. If the routes are similar, to the empty-network routes, it could have several reasons:

1) there is not enough traffic in the network, so no jamming develops which would make cirumventing routes more attractive

2) the circumventing routes which you are are missing in your results are slower than in reality due to some network modelling errors

3) the routes through the city are faster than in reality due to some network modelling errors

4) there is so much traffic that everything is jammed and no good signal is generated for the routing algorithm

Most of these reasons would also apply to duaIterate but In our experience, duaIterate most often breaks down due to (4).

A good way to investigate the problem is to color the edges in sumo-gui to reflect the averaged speeds which form the basis for the route choice: http://sumo.dlr.de/wiki/Demand/Automatic_Routing#Investigating_edge_weights

regards,

Jakob

2018-07-31 5:49 GMT+02:00 Vrinda Khirwadkar (vkhrwdkr) <vkhrwdkr@xxxxxxxxxxx>:

Hi Jakob,

I tried to load the trips generated by od2trips directly into SUMO but still the routes are similar. I also tried to use Duaiterate with below configuration but while validating the output (edgestatedump) with our validation count data, the correlation results are not good. It is coming in between 0.2-0.3.

Configuration of duaiterate -

"C:\Users\Bhushan\sumo-msvc12x64-git\sumo-git\tools\assign\duaIterate.py" -n "C:\Users\Bhushan\Sumo\2018-06-05-21-00-00\map.net.edited1.xml" -b 109800 -e 118800 -t "C:\Users\Bhushan\Sumo\2018-06-05-21-00-00\Trips\map.trip_June2_AM_scale_0.1.xml" -l 40 --convergence-iterations "5" --max-convergence-deviation "0.5" --pessimism "1".

Please let me know if any more parameters needs to be provided in duaiterate. 

Also, let me restate my problem statement and it will be helpful if you could provide your insights-

As an input, I am taking a network from OSM along with polygon shape files and OD matrix which I am providing to generate trips. We want to run a simulation which is close to real world to compare it with the real world count data on different edges for the same network. As always I appreciate your suggestions and feedback.

Thanks,

Vrinda Khirwadkar

University of Memphis

---

From: Jakob Erdmann <namdre.sumo@xxxxxxxxx>
Sent: Monday, July 30, 2018 12:23 AM
To: Sumo project User discussions
Cc: Vrinda Khirwadkar (vkhrwdkr)
Subject: Re: [sumo-user] Demand generation using OD matrix

 

When not given any other information, DUAROUTER picks the fastest route under the assumption that the network is empty.

To get better routes you need to perform user assignment.

A quick fix you can try is to load the trips generated by od2trips direclty into SUMO. This way, vehicles will react to traffic conditions at the time of insertion and the routes will be more realistic.

A more elaborate way is explained here: http://sumo.dlr.de/wiki/Demand/Dynamic_User_Assignment

regards,

Jakob

2018-07-30 6:39 GMT+02:00 Vrinda Khirwadkar (vkhrwdkr) <vkhrwdkr@xxxxxxxxxxx>:

Hello SUMO authors,

I have a network and creating trips using OD2trips. It picks an edge ID from a TAZ but OD2trips is generating the vehicles which are mostly on internal roads, they are not generating  from highways/freeways which should be the case in the real world. 

Is there a way that I could assign trips so that the vehicles should generate from highways?

I also tried generating routes using DUAROUTER , but still it is taking the same internal routes.  In order to generate a scenario close to real world, please let me know a way using which we can enforce vehicles to follow highways/freeways rather than internal ways(roads containing traffic signals). Your help is highly appreciated.

Thanks,

Vrinda Khirwadkar

University of Memphis

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