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. 2020 Sep:7:100212.
doi: 10.1016/j.trip.2020.100212. Epub 2020 Sep 8.

Changes in urban mobility in Sapporo city, Japan due to the Covid-19 emergency declarations

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Changes in urban mobility in Sapporo city, Japan due to the Covid-19 emergency declarations

Mikiharu Arimura et al. Transp Res Interdiscip Perspect. 2020 Sep.

Abstract

At the time of writing, the world is facing the new coronavirus pandemic, which has been declared one of the most dangerous disasters of the 21st century. All nations and communities have applied many countermeasures to control the spread of the epidemic. In terms of countermeasures, lockdowns and reductions of social activities are meant to flatten the curve of infection. Nevertheless, to date, there has been no evaluation of the effectiveness of these methods. Thus, the present study aims to interpret the change in the population density of Sapporo city in the emergency's period declaration using big data obtained from mobile spatial statistics. The results indicate that, in the time of refraining from traveling, the city's residents have been more likely to stay home and less likely to travel to the center area. This has led to a decrease of up to 90% of the population density in crowded areas. The study's outcomes partly explain the statement of reducing 70%-80% of contact between people in line with the purpose of the emergency declaration. Moreover, these findings establish the primary step for further analysis of estimating the efficiency of policy in controlling the epidemic.

Keywords: Big data; Covid-19; Mobile spatial statistics; Moving pattern; Population concentration.

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Figures

Fig. 1
Fig. 1
Number of infected cases in Japan and Hokkaido by day.
Fig. 2
Fig. 2
Timeline for the periods of analysis. ED: state of emergency declaration.
Fig. 3
Fig. 3
Population distribution on weekdays, working hour (14:00) in the period before ED (i) and during the first ED (ii), second ED (iii) and Golden Week (GW) (iv).
Fig. 4
Fig. 4
Population distribution on weekdays, during the night-time (22.00) in the periods before ED (i) and during the first ED (ii), second ED (iii) and GW (iv).
Fig. 5
Fig. 5
Changes in population by days in the CBD area. (Day 0 is equal to 1st of January 2020).
Fig. 6
Fig. 6
Decrease in population concentration on weekdays, day time (14:00) in the periods of Before ED (i), First ED (ii), Second ED (iii), and GW (iv).
Fig. 7
Fig. 7
Decrease in population concentration on weekdays, at night (22:00) in the periods before ED (i) and during the first ED (ii), second ED (iii), and GW (iv).
Fig. 8
Fig. 8
Decrease in population concentration on holidays during the day (14:00) in the periods before ED (i) and during the first ED (ii), second ED (iii), and GW (iv).
Fig. 9
Fig. 9
Decrease in population concentration on holidays at night-time (22:00) in the periods before ED (i) and during the first ED (ii), second ED (iii), and GW (iv).

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