| Re: [sumo-user] Number of vehicles in each timestep changes |
Some outputs such as meanData output allow setting begin and end times for their output.For fcd-output this is not possible directly. There are several workarounds:- export output for the whole simulation, then cut of the undesired parts in post-processing (the output is order by time which makes this easy)- save the simulation state at some point. Then load the simulation from this state and start the output (https://sumo.dlr.de/docs/Simulation/SaveAndLoad.html#know_issues)- only equip some of the vehicles with a fcd device but set a large radius that covers the whole network (device.fcd.radius). The output will then be limited to the time where these vehicles activeregards,Jakob_______________________________________________Am Mi., 25. März 2020 um 22:00 Uhr schrieb Leonardo Solé Rodrigues <leosole@xxxxxxxxxxxx>:Thanks for the reply.Is there a way to simulate a longer time period, but just export a smaller window of it?_______________________________________________Em qua, 25 de mar de 2020 17:48, Jakob Erdmann <namdre.sumo@xxxxxxxxx> escreveu:Hello,the low number if vehicles at the start is typical because the networks starts empty and has to fill up.The high number of vehicles later in the simulation occurs because that scenario is horribly congested. Mostly due issues with the network (https://sumo.dlr.de/docs/Data/Scenarios/TAPASCologne.html#quality). I'm planning to release an updated version of the scenario this year.Until then you could down-scale the traffic demand to avoid the worst congestion (--scale 0.5 or lower)regards,Jakob_______________________________________________Am Mi., 25. März 2020 um 21:20 Uhr schrieb Leonardo Solé Rodrigues <leosole@xxxxxxxxxxxx>:I'm new to SUMO, and I'm trying to export some traces, so I can use them in python. I exported some FCD Output (xml) files from a simulation, each with a 10 minute length, at different starting times. I'm using the traces from this project. They all go from around 20 vehicles in the starting seconds to around 10000 to 20000 in the last seconds. I exported these files using the --fcd-output option, and giving a begin and end times. Why do the number of vehicles change so much? Is there a way I can fix this?_______________________________________________Below is a plot of the number of vehicles in each timestep in one of the files.
--Leonardo Solé Rodrigues
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