Thank you so much dear Jakob. On Fri, Jun 12, 2020 at 2:13 AM Jakob Erdmann <[email protected]> wrote:
> 1) if you set your frequency to ~half the cycle time, you should see some > data points with higher flow. When averaging over a full cycle you would > still mix green and red phases > 2) yes, each interval would give you one datapoint. For network-wide > density you could use the total number of vehicles (sampledSeconds / freq) > and divide it by the total network lane length (shown in the network > property dialog in sumo-gui, accessible when clicking on the car icon in > the bottom bar). > 3) I haven't looked systematically at urban fundamental diagrams but I > think your plot is plausible > > Am Do., 11. Juni 2020 um 17:15 Uhr schrieb Amirhosein Karbasi < > [email protected]>: > >> Thank you, dear Jakob. >> 1.now if I use freq equal to traffic light cycle the problem will be >> solved? >> 2.you said "the flow data points you are using are for individual edges. >> If you need a whole-network diagram you need to sum up the edges flows and >> compute an average density." for flow I should only aggregate flows in >> the intervals and should I compute average ? >> 3. you said " in your scenario, the flow is mostly affected by the >> traffic lights rather than the vehicle density. Thus it will look different >> from a motorway diagram". is this normal in intersections? >> >> On Thu, Jun 11, 2020 at 4:55 PM Jakob Erdmann <[email protected]> >> wrote: >> >>> 1) in your scenario, the flow is mostly affected by the traffic lights >>> rather than the vehicle density. Thus it will look different from a >>> motorway diagram >>> 2) the flow data points you are using are for individual edges. If you >>> need a whole-network diagram you need to sum up the edges flows and compute >>> an average density. Also, the flow is averaged over 300s (more than one >>> traffic light cycle). This means you are not seeing peak flow on green but >>> the average flow including stopped-on-red >>> 3) I recommend that you use 'entered + departed' for you flow >>> computation. Also, there are probably edges that have low vehicle counts >>> but downstream congestion prevents vehicles from advancing and thus gives >>> zero flow. >>> >>> regards, >>> Jakob >>> >>> Am Do., 11. Juni 2020 um 12:20 Uhr schrieb Amirhosein Karbasi < >>> [email protected]>: >>> >>>> Hello, >>>> >>>> I want to draw a flow density diagram. My network includes 64 >>>> intersections. I ran a simulation (1800s) and use an additional file for >>>> Edge-based output (freq is 300). I drew a flow density diagram in excel >>>> based on the Edge-based output file and I calculated flow according to “ >>>> *entered* * 3600 / *freq*”. Now I have 3 problems: >>>> >>>> 1. I think my flow density diagram is not similar to regular flow >>>> density diagrams. (there are a png in attach file)(Simulation time = >>>> 1800s). >>>> >>>> 2. When I drew a plot my max flow is about 852 (for 1800s, 2400s, and >>>> full-time simulation max flow is approximately 1000) and I think max flow >>>> should be bigger than 20000 for a network like this. >>>> >>>> 3. I have too many zero flows. >>>> >>>> I saw various topics about this on the Sumo website but my problems are >>>> not solved yet. >>>> >>>> I sent my whole files too. please say me what I am doing wrong? >>>> >>>> Thank you so much. >>>> _______________________________________________ >>>> sumo-user mailing list >>>> [email protected] >>>> To unsubscribe from this list, visit >>>> https://www.eclipse.org/mailman/listinfo/sumo-user >>>> >>> _______________________________________________ >>> sumo-user mailing list >>> [email protected] >>> To unsubscribe from this list, visit >>> https://www.eclipse.org/mailman/listinfo/sumo-user >>> >> _______________________________________________ >> sumo-user mailing list >> [email protected] >> To unsubscribe from this list, visit >> https://www.eclipse.org/mailman/listinfo/sumo-user >> > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user >
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