“…We differentiate these studies by their inputs: - Cellphone location (Arimura, Ha, Okumura, & Asada, 2020 ; Gao, Rao, et al., 2020 ; Kang, Gao, et al., 2020 ; Kapoor et al., 2020 ; Pepe et al., 2020 ; Roy & Kar, 2020 ; Yabe et al., 2020 ; Ye et al., 2020 ).
- Internet and social networks: Google (Husnayain, Shim, Fuad, & Su, 2020 ; Kapoor et al., 2020 ; Nguyen et al., 2020 ; PĂĄszto & VondrĂĄkovĂĄ, 2020 ), Baidu (Cheng et al., 2020 ; Liu, Fang, et al., 2020 ; Mu, Yeh, & Zhang, 2020 ; Shen, 2020 ; Shi et al., 2020 ; Tong, Ma, & Liu, 2020 ; Xu, Wang, Dong, Shen, & Xu, 2020 ), Facebook (Coven & Gupta, 2020 ; Heo, Lim, & Bell, 2020 ; Kuchler, Russel, & Stroebel, 2020 ), Twitter geotagged tweets (Iranmanesh & Alpar Atun, 2021 ; Li, Li, et al., 2020 ; Saeed et al., 2021 ; Yang et al., 2020 ), Weibo (Peng, Wang, Liu, & Wu, 2020 ), Quingbo (Zhu, Zheng, Liu, Li, & Wang, 2020 ).
- Air and sea transport (Depellegrin, Bastianini, Fadini, & Menegon, 2020 ; Snyder & Parks, 2020 ; Sun, Wandelt, & Zhang, 2020 ; ValjareviÄ et al., 2020 ).
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