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http://dx.doi.org/10.3741/JKWRA.2022.55.11.855

A study of artificial neural network for in-situ air temperature mapping using satellite data in urban area  

Jeon, Hyunho (Department of Global Smart City, Sungkyunkwan University)
Jeong, Jaehwan (Center for Built Environment, Sungkyunkwan University)
Cho, Seongkeun (Department of Water Resources, Sungkyunkwan University)
Choi, Minha (Department of Water Resources, Sungkyunkwan University)
Publication Information
Journal of Korea Water Resources Association / v.55, no.11, 2022 , pp. 855-863 More about this Journal
Abstract
In this study, the Artificial Neural Network (ANN) was used to mapping air temperature in Seoul. MODerate resolution Imaging Spectroradiomter (MODIS) data was used as auxiliary data for mapping. For the ANN network topology optimizing, scatterplots and statistical analysis were conducted, and input-data was classified and combined that highly correlated data which surface temperature, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), time (satellite observation time, Day of year), location (latitude, hardness), and data quality (cloudness). When machine learning was conducted only with data with a high correlation with air temperature, the average values of correlation coefficient (r) and Root Mean Squared Error (RMSE) were 0.967 and 2.708℃. In addition, the performance improved as other data were added, and when all data were utilized the average values of r and RMSE were 0.9840 and 1.883℃, which showed the best performance. In the Seoul air temperature map by the ANN model, the air temperature was appropriately calculated for each pixels topographic characteristics, and it will be possible to analyze the air temperature distribution in city-level and national-level by expanding research areas and diversifying satellite data.
Keywords
ANN; Air temperature; Seoul; Mapping; AWS; MODIS-Terra;
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