A COMPARATIVE ANALYSIS ANALYSIS OF URBAN TEMPERATURE (AIR/SURFACE) AND HEAT ISLAND INTENSITY USING S·DOT AND LANDSAT8 IN SEOUL OF SOUTH KOREA

Abstract

More than half of the world's population lives in cities, and according to the United Nations, about 70% of the world's population will live in urban areas by 2050, given the current trajectory of urban growth. (United Nations, 2010) The growth of these cities causes climate change and aggravates abnormal weather phenomena such as heatwaves. This heatwave phenomenon causes the Urban Heat Island (UHI) phenomenon, which is one of the phenomena that occurs with the progress of urbanization, which refers to a phenomenon in which the air and surface temperature in the downtown area are higher than in the surrounding areas. (JA Voogt TR Oke, 2003) The UHI phenomenon worsens the urban environment, such as heatwaves and tropical nights, and threatens the life and health of urban residents. As a result, about 50% of the population is concentrated in the metropolitan area, which is about 10% of the national land area, and various urban problems such as an imbalance in national land development and the UHI phenomenon are occurring mainly in the metropolitan area. As a result, the average outdoor temperature was 13.5℃ in the 2019s, 1.1℃ higher than in the 1960s, and it is a continuous increase. It affects the climate change and the natural environment of downtown areas, impairs the quality of the urban environment, and threatens the health of urban residents. If the city's temperature continues to rise and climate change and destruction of the natural environment intensify, the quality of the urban environment may be compromised, which will endanger the health and life of city residents. Accordingly, from 2020, through the Smart Seoul Urban Data Sensor (S·DoT) construction project, the city of Seoul is building an industrial ecosystem using policies and city data to solve urban problems and improve citizens’ lives. Therefore, this study aims to present the possibility of using urban data sensors (S·DoT) by examining the temperature of Seoul and the surface temperature data of LANDSAT8, calculating and comparing the thermal island intensity of the air temperature and the surface temperature.