Abstract
Since Dec. 2019, people’s behavior has been drastically changed caused by the epidemic of the coronavirus disease
(COVID-19) pandemic. In Japan, since infections are commonly reported on facilities where many people gather, the
government recommends that to take thorough infection prevention measures in such facilities. To reveal densely
populated areas is important for planning infection prevention measures in each region. Therefore, in this study, we
estimate a relative population density of facilities in Narashino, Chiba. Specifically, densely populated areas are
calculated by the kernel density estimation based on the point-type floating population data. Moreover, we specify and
classify facility types that infection prevention measures should be reinforced by the relative population density.
Experimental results imply that the heavy restriction of people’s behavior is important in terms of infection prevention.