Estimating Daytime and Nighttime Population Density for Coastal Communites in Oregon

Hazard preparedness has become a critical issue for local populations who are potentially vulnerable to natural disasters. Essential to preparedness planning is determining where people are likely to be located, which varies from day to night. The fundamental approaches to geographic scale and cartographic representation are an integral aspect of how population distribution is represented over space. Using a dasymetric mapping technique, residential populations are estimated by interpolating the census block values to 10 m pixels based on parcellevel land use and density. To determine daytime population estimates, a quantitative employee database gives x,y point locations of each business and exact numbers of how many people are employed within a coastal community. From census records, we can estimate the number of people who are leaving their residences during the daytime to go to work outside of a tsunami hazard zone.