Geographia Technica, Vol 17, Issue 2, 2022, pp. 179-192
NIGHTTIME AND DAYTIME POPULATION ESTIMATION FROM OPEN DATA
Nelson MILEU 
, Margarida QUEIRÓS
ABSTRACT: Most of the studies on population loss and damage, due to earthquakes or any other natural or anthropogenic catastrophe rely on methodologies that usually make use of the resident population counted in the latest census. However, the need for disaggregated data for high extensions of territory and the increasing availability of open data opens new possibilities for the construction of population exposure models. Essential to emergency planning is determining where people are likely to be located, which varies from day to night, from weekdays or weekends and / or seasonally. Focusing on variations from day to night, using addresses open data, night populations are estimated at building level. To determine daytime population estimates, points of interest representing the locations of each business together with administrative and statistical data are used to establish how many people are employed or study on each building. The result for daytime population is 19% higher than the nighttime population confirming the commuting official values.
Keywords: Population distribution, Population exposure, Open data, Earthquake
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