There are multiple options to do that, although I'm not sure why you
absolutely need to given the alternatives to get density values. If you
want to use TraCI, just read the vehicles on a lane using traci.lane.
getLastStepVehicleIDs and then get their positions and vehicle lengths to
derive the space of a single vehicle (length + following distance). Any
output which can print vehicle positions (e.g. FCD output) would give you
the opportunity as well to get there.
Then there are instant induction loops
<https://sumo.dlr.de/docs/Simulation/Output/Instantaneous_Induction_Loops_Detectors.html>
which obviously return values only for a certain position on a lane when a
vehicle enters/leaves it. Now, every output file can be read using Python -
the question is rather whether you need the result during the simulation or
not.
Best regards
Mirko
-----Original-Nachricht-----
Betreff: Re: [sumo-dev] Lane Area Detector output data clarification
Datum: 2023-11-17T18:49:04+0100
Von: "Desu Venkata Manikanta" <manikanta.d...@tcs.com>
An: "Desu Venkata Manikanta via sumo-dev" <sumo-dev@eclipse.org>, "Mirko
Barthauer" <m.bartha...@t-online.de>
TCS Confidential
Thank you, Mirko, for your detailed explanation. Instead of relying on
edgeData output for density, we can calculate density as inverse of spacing
between the vehicles right. How to get the average spacing of vehicles
using traci or any other ways in python?
Please correct me if i am wrong.
Regards
Manikanta
TCS Confidential
------------------------------------------------------------------------
From: Mirko Barthauer <m.bartha...@t-online.de>
Sent: Friday, November 17, 2023 8:02 PM
To: sumo developer discussions <sumo-dev@eclipse.org>; Desu Venkata
Manikanta via sumo-dev <sumo-dev@eclipse.org>
Cc: Desu Venkata Manikanta <manikanta.d...@tcs.com>
Subject: AW: [sumo-dev] Lane Area Detector output data clarification
External Email : Be cautious while opening any links or attachments.
No need to send the same question twice. Here
<https://sumo.dlr.de/docs/Tutorials/FundamentalDiagram.html#fundamental_diagram_of_a_closed_circular_route>
are our advices for fundamental diagrams. Essentially you need to capture
multiple densities and speeds to fill the diagram with data points.
Break-down is done by creating a bottleneck (speed or lane reduction, lane
change events etc...).
Best regards
Mirko
-----Original-Nachricht-----
Betreff: [sumo-dev] Lane Area Detector output data clarification
Datum: 2023-11-17T11:43:45+0100
Von: "Desu Venkata Manikanta via sumo-dev" <sumo-dev@eclipse.org>
An: "Desu Venkata Manikanta via sumo-dev" <sumo-dev@eclipse.org>
TCS Confidential
Hi Team,
For plotting the macroscopic flow diagrams, I need flow rate, speed and
density values right. How will I get those from Lane Area Detectors or from
the simulation. How to derive the above parameters. Please suggest any
alternatives for the above scenario to make it more realistic.
Regards
Manikanta
TCS Confidential
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