| Re: [sumo-user] e1 and e2 detector |
I think the e1 type is unfit for this, since it has no real length. e2 could be used if the area you are interested in lies on a single edge. In that case the methods you mentioned should do the trick, and otherwise consult the documentation: you could also retrieve data for an edge, for example: https://sumo.dlr.de/docs/TraCI/Edge_Value_Retrieval.html
The e3 type detector might be interesting if your area of interest spans multiple edges: https://sumo.dlr.de/docs/TraCI/Multi-Entry-Exit_Detectors_Value_Retrieval.html
Greets, Menno
I have had a look at it. But, as far as I know, I should ask the simulation to get or set the vehicle data one at a time via that module(traci.vehicle). I am looking for a facility to get the flow data at a specific point automatically which I was thinking could be e1 or e2 detector.
Regards,Ali
On Fri, May 14, 2021 at 1:52 PM Menno van der Woude <menno@xxxxxxxxxxxxxxxxxx> wrote:
_______________________________________________the documentation provides ample info here:
https://sumo.dlr.de/docs/TraCI/Vehicle_Value_Retrieval.html
I guess you could first determine what vehicles are in a given area or location, and then retrieve data for those vehicles.
Greets, Menno
On 14-5-2021 11:20, ali mirzaei wrote:
I get the point you said. But, my other question remains. What is the option to receive vehicle data at a specific point?Regards,Ali
On Fri, May 14, 2021 at 12:37 PM Menno van der Woude <menno@xxxxxxxxxxxxxxxxxx> wrote:
_______________________________________________That function should return the described value. However, if no vehicles were on the detector during the last step, no valid data can be returned, so you get -1 and (). If a vehicle was on the detector during the last step, the method will give you the data.
Greets, Menno
On 14-5-2021 10:04, ali mirzaei wrote:
Hi Menno,
This is what the mannaul says:
getLastStepMeanSpeed(self, detID)getLastStepMeanSpeed(string) -> double
Returns the current mean speed in m/s of vehicles that were on the named e2.
I am looking for a tool by which I can extract the flow characteristics at the time the vehicle is on the detector. So, is there any option to get more data of vehicles in traci.lanearea module?
Sincerely,ALI
On Fri, May 14, 2021 at 11:33 AM Menno van der Woude <menno@xxxxxxxxxxxxxxxxxx> wrote:
Hello Ali,
the e1 detector has no length, I think you should use an e2 detector if
you want to have a detector that covers an area.
Regarding the functions: when do you call these? I'd expect -1 and ()
when no vehicles were on the detector during the last step. So at the
start of the simulation, you will most likely get those results. And
afterwards if there has been no traffic.
Greets, Menno
On 13-5-2021 23:28, ali mirzaei wrote:
> Hi everyone,
> 1- What is the length of the induction loop(e1detector)?
> 2- in the case of e2detector, when I generate my add.XML file consisting of:
> <e2Detector id="e2Detector_1" lane="e2_0" pos="15.22"
> length="10.00" freq="5" file="e2_det.xml" friendlyPos="1"/>
> and call the functions:
> print(traci.lanearea.getLastStepMeanSpeed("e2Detector_1"))
> print(traci.lanearea.getLastStepVehicleIDs("e2Detector_1"))
> the answer is "-1" and "()".
> Why does this happen?
> Any help would be appreciated.
>
> Regards,
> Ali
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