RESEARCH
📚 Representative Works
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Air Temperature
Accurate temperature monitoring is critical to understanding and managing urban climate dynamics, especially in the context of rising global temperatures and increasing frequency of extreme events. However, due to the limited number of in situ air temperature monitoring stations, a significant gap exists in understanding detailed temperature patterns across cities.
To address this problem, we utilize satellite-derived land surface temperature (LST) data, which provides comprehensive spatial coverage across urban terrain. We integrate machine learning techniques with LST data to reconstruct daily maximum and minimum temperatures for areas that cannot be directly measured.
We also apply spatial interpolation methods to estimate air temperatures in unmonitored regions. We trained a machine learning model with satellite data and in situ observations to create a seamless spatial map of air temperature. Compared to the smoothed spatial distribution of the traditional geostatistical model, Cokriging, our model was found to better represent heterogeneous spatial patterns. This methodology enhances our ability to effectively monitor air temperature, helping us better understand and manage heat risks in cities.
Yoo et al., 2018
Cho et al., 2020
📝 Publications
Last updated : 2026/03/08
Lee, S., Kang, Y., Sung, T., Hwang, S., Yang, S., & Im, J. (2026). Mapping nationwide 1 Km hourly human mobility (2022–2024) across South Korea using multi-source data. GIScience & Remote Sensing.
Kim, Y., Park, S., Kim, H., Bae, D., Lee, Y., Lee, S., ... & Im, J. (2025). Long-Term (2013–2024) Reconstructed All-Sky Land Surface Temperature from MODIS Integrating Machine Learning and Cloud Conditions for South Korea, South Korea. Korean Journal of Remote Sensing.
Park, S., Kim, H. J., Kim, Y., Lee, Y., Cho, D., Yoo, C., ... & Im, J. (2025). Nationwide Local Climate Zone Mapping and Comparative Assessment of Urban Heat Island Effects in South Korea, South Korea. Korean Journal of Remote Sensing.
Lee, Y., Jegal, S., Lee, S., Son, B., & Im, J. (2025). Impact of urban tree canopy on land surface temperature and green space inequities in Suwon, South Korea. Korean Journal of Remote Sensing.
Kim, Y., Yoo, C., & Im, J. (2025). Nighttime satellite land surface temperature for urban applications: achievements, challenges, and future prospects. GIScience & Remote Sensing.
Bae, D., Cho, D., Im, J., Yoo, C., Lee, Y., & Lee, S. (2025). Improved hourly all-sky land surface temperature estimation: Incorporating the temporal variability of cloud-radiation interactions. International Journal of Applied Earth Observation and Geoinformation.
Kim, Y., Lee, S., Cho, D., & Im, J. (2024). Impact of covid-19 on the urban heat island in daegu using downscaled land surface temperature. Korean Journal of Remote Sensing.
Lee, Y., Cho, D., Im, J., Yoo, C., Lee, J., Ham, Y. G., & Lee, M. I. (2024). Unveiling teleconnection drivers for heatwave prediction in South Korea using explainable artificial intelligence. npj Climate and Atmospheric Science, 7(1), 176.
Cho, D., Im, J., & Jung, S. (2024). A new statistical downscaling approach for short‐term forecasting of summer air temperatures through a fusion of deep learning and spatial interpolation. Quarterly Journal of the Royal Meteorological Society, 150(760), 1222-1242.
Yoo, C., Im, J., Weng, Q., Cho, D., Kang, E., & Shin, Y. (2023). Diurnal urban heat risk assessment using extreme air temperatures and real-time population data in Seoul. Iscience, 26(11).
Lee, S., Yoo, C., Im, J., Cho, D., Lee, Y., & Bae, D. (2023). A hybrid machine learning approach to investigate the changing urban thermal environment by dynamic land cover transformation: A case study of Suwon, republic of Korea. International Journal of Applied Earth Observation and Geoinformation, 122, 103408.
Yoo, C., Im, J., Cho, D., Lee, Y., Bae, D., & Sismanidis, P. (2022). Downscaling MODIS nighttime land surface temperatures in urban areas using ASTER thermal data through local linear forest. International Journal of Applied Earth Observation and Geoinformation, 110, 102827.
Cho, D., Bae, D., Yoo, C., Im, J., Lee, Y., & Lee, S. (2022). All-sky 1 km MODIS land surface temperature reconstruction considering cloud effects based on machine learning. Remote Sensing, 14(8), 1815.
Cho, D., Yoo, C., Son, B., Im, J., Yoon, D., & Cha, D. H. (2022). A novel ensemble learning for post-processing of NWP Model's next-day maximum air temperature forecast in summer using deep learning and statistical approaches. Weather and Climate Extremes, 100410.
Lee, Y., Lee, S., Im, J., & Yoo, C. (2021). Analysis of Surface Urban Heat Island and Land Surface Temperature Using Deep Learning Based Local Climate Zone Classification: A Case Study of Suwon and Daegu, Korea. Korean Journal of Remote Sensing 37(5-3), 1447-1460.
Cho, D., Yoo, C., Im, J., Lee, Y., & Lee, J. (2020). Improvement of spatial interpolation accuracy of daily maximum air temperature in urban areas using a stacking ensemble technique. GIScience & Remote Sensing, 1-17.
Cho, D., Yoo, C., Im, J., & Cha, D. H. (2020). Comparative Assessment of Various Machine Learning‐Based Bias Correction Methods for Numerical Weather Prediction Model Forecasts of Extreme Air Temperatures in Urban Areas. Earth and Space Science, 7(4), e2019EA000740.
Yoo, C., Lee, Y., Cho, D., Im, J., & Han, D. (2020). Improving Local Climate Zone Classification Using Incomplete Building Data and Sentinel 2 Images Based on Convolutional Neural Networks. Remote Sensing, 12(21), 3552.
Yoo, C., Im, J., Park, S., & Cho, D. (2020). Spatial Downscaling of MODIS Land Surface Temperature: Recent Research Trends, Challenges, and Future Directions. Korean Journal of Remote Sensing, 36(4), 609-626.
Yoo, C., Im, J., Cho, D., Yokoya, N., Xia, J., & Bechtel, B. (2020). Estimation of All-Weather 1 km MODIS Land Surface Temperature for Humid Summer Days. Remote Sensing, 12(9), 1398.
Yoo, C., Han, D., Im, J., & Bechtel, B. (2019). Comparison between convolutional neural networks and random forest for local climate zone classification in mega urban areas using Landsat images. ISPRS Journal of Photogrammetry and Remote Sensing, 157, 155-170.
Yoo, C., Park, S., Kim, Y., & Cho, D. (2019). Analysis of Thermal Environment by Urban Expansion using KOMPSAT and Landsat 8: Sejong City. Korean Journal of Remote Sensing, 35(6_4), 1403-1415.
Yoo, C., Im, J., Park, S., & Quackenbush, L. J. (2018). Estimation of daily maximum and minimum air temperatures in urban landscapes using MODIS time series satellite data. ISPRS journal of photogrammetry and remote sensing, 137, 149-162.
Yoo, C., Im, J., Park, S., & Cho, D. (2017). Thermal characteristics of Daegu using land cover data and satellite-derived surface temperature downscaled based on machine learning. Korean Journal of Remote Sensing, 33(6_2), 1101-1118.