Hello Sara, I think the density is like the occupancy rate. If you consider a sidewalk 1.5 meters wide with two people walking side by side and 60 cm between each group, then there would be 1 666 pedestrians over a distance of 500 meters. 2 (500 m / 0.6 m). So 1 666 people would be the maximum occupancy rate (100%) on the sidewalk - the queue would be full. The next step is to compare the number of pedestrians on the section to this maximum number.
density = number of pedestrians / maximum number of pedestrians on the edge To know how many pedestrians there are on the section, it is then necessary to know the walking speed of each pedestrian. If the walking speed is 5 km / h, it takes 360 seconds (or 6 minutes) to make a trip of 500 meters. By adding a new pedestrian every 35 seconds, there would be 10 pedestrians on the section (edge), 360 / 35. The occupancy rate in this case would be less than 1% (10 / 1 666). I am not sure that the simplest approach, but that's the way I would do it. One should also add the people waiting at the intersection, in this case the density would not be uniform. We can also consider that the crowd is more or less compressible, so that people can be closer if necessary. Hope this can help you. François PS: Maybe SUMO is already doing some of those calculations, but I do not know these functions. François Vaudrin, ing, MBA Laboratoire ERICAE Faculté des Sciences et de Génie Université Laval, CANADA ________________________________________ De : Sara el hamdani via sumo-user [sumo-user@lists.sourceforge.net] Envoyé : 3 janvier 2018 05:16 À : sumo-user Objet : [sumo-user] How to explain pedestrian frequency in a paper? Hello all, In my simulation setup I used the --period 35 s, what is equivalent to 100 (ped/h). In my research paper I named the value 100 (ped/h) pedestrian density. And I got this question from the reviewer: "You did not define what pedestrian density mean?". I could not explain it from the defenition of the the period from the wiki. Could anybody help me to make the value more clear? -- *Best regards* *Sara EL HAMDANI* *Phd student -Umi University.* ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ sumo-user mailing list sumo-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sumo-user ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ sumo-user mailing list sumo-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sumo-user
