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Press Releases

  • Analysis of City Data “S-DoT” Collected by 1,100 Sensors in Seoul is Released

  • Press Releases SMG 686
    • Seoul announced an analytical result of S-DoT collected from April 2020 to March 2021.
    • By comparing the data accumulated by S-Dot, which is installed in major mountains, riversides, and downtowns, the analysis examined how different Seoulites’ living environment is by each area’s characteristics.
    • S-DoT is Seoul’s home-grown comprehensive IoT sensors that collect 17 kinds of urban data, including the temperature, humidity, illumination level, noise, and ultrafine particles, every two minutes. There are 1,100 S-DoT in downtown areas, mountains, and riversides.

    SEOUL, SOUTH KOREA, June 3, 2021 – Seoul announced an analytical result of S-DoT (Seoul Data of Things)—Seoul’s IoT (Internet of Things) city data platform—collected for a year from April 2020 to March 2021. By comparing the data accumulated for a year by S-Dot, which is installed in major mountains, riversides, and downtowns, the analysis examined how different Seoulites’ living environment is by each area’s characteristics.

    S-DoT is Seoul’s home-grown comprehensive IoT sensors that collect 17 kinds of urban data, including the temperature, humidity, illumination level, noise, and ultrafine particles, every two minutes. There are 1,100 S-DoT in downtown areas, mountains, and riversides. Data collected by S-DoT is being used to check urban phenomena and establish data-based smart city policies.

    <Identifying Urban Heat Island by Comparing Temperatures in Downtowns, Mountains, and Riversides>

    The comparison result of S-DoT data from downtown areas, mountains, and riversides showed that the temperature of the city centers were 2.32°C higher in summer and 2.16°C higher in winter than the mountain. In sum, the urban heat island effect was identified as the centers were 1 to 3°C hotter on average.

    In 2020, on the sunniest and hottest day, the downtowns were 3 to 3.4°C or up to 7°C hotter than the mountain, and 1.6 to 1.9°C, or up to 4.3°C hotter than the riverside.

    The temperature gaps between the downtown and mountain and between the downtown and the riverside are affected by numerous factors such as the regions, time, weather, and season, but data showed that the bigger the humidity gaps, the bigger the differences in temperature.

    Unlike the Korea Meteorological Administration, which measures the climate in a standardized environment, S-DoT, installed in the city center, is influenced by urban conditions such as adjacent buildings, roads, and air conditioning systems. Moreover, since S-DoT can be found outdoors—in Seoul’s mountains and Hangang Parks—as well as in crowded buildings, roads, bus, and subway stations, comparison between various areas of the city is possible.

    <Humidex and Heat Index Is Higherinthe Center, While Ultrafine Dust Showed Seasonal& Regional Differences>

    In summer, people in the city center felt displeasure (due to humidity) earlier than those in the mountain or riverside areas, and such feelings lasted two to three weeks longer Compared to downtowns, mountain areas’ ultrafine particle level was 11.5 ug/m3 lower from November to March on average. From February to March, it was lower by 15 ug/m3, showing a more significant gap. Meanwhile, the ultrafine dust levels of the riverside and the center were
    similar in large.

    In other seasons than winter, the levels of the ultrafine particles showed a generally similar pattern.

    <Impacts of 1°C on The City Life>

    City centers are usually 1 to 3°C hotter in summer than the mountain and riversides. Hence, an increase in AC bills is expected, but as it is 1 to 2°C warmer in winter as well, there would be a reduction effect in the heating expenditure.

    As S-DoT analysis demonstrates that in summer, the displeasure is higher and lasts longer in comparison with the other two areas, summer is more likely to have violent crimes and traffic accidents. As a result, it is necessary to take preventive measures to stop such incidents in city centers.

    As the heat index is higher and hot and humid tropical nights last longer in the center in summer, the city needs to reinforce its management system on socially isolated single-person households, seniors, and other groups of people with special needs.

    S-DoT’s collected data will be provided to Seoul citizens as urban life environment information in real-time at Smart Seoul Map (https://map.seoul.go.kr) from August. If you click a nearby S-DoT on Smart Seoul Map, you can get life environment information of areas close to your living areas.

    “S-DoT serves as a densely woven, optimum infrastructure to look at the urban phenomenon,” said Lee Weon-Mok, Director General of Smart City Policy Bureau. “The SMG will provide services and policies that can improve the value of the city and practically helps our citizens’ lives by converging and analyzing data of S-DoT along with the data from the public, private, and academic sectors.”

    S-DoT installation area (1,100 units)

    S-DoT installation area (1,100 units)

    S-DoT installation

    S-DoT installation