Abstract
In this study, we evaluated the land surface temperatures (LSTs) retrieved from the GEO-KOMPSAT-2A (GK-2A) satellite AMI sensor by comparing them to LSTs measured at 106 ground-based stations (95 ASOS and 11 AAOS stations). In addition, the statistical performance of the GK-2A AMI LST was compared with those of LSTs retrieved from the MODIS and S-VISSR satellites. LSTs were evaluated in terms of inland versus coastal regions and at different inland elevations. A time series analysis of the entire study period confirmed that the GK-2A satellite yielded the smallest bias among four satellite-based LST products. The satellite-based LSTs also exhibited higher correlations with ground-based measurements in the inland region than in the coastal region. In addition, the difference in LSTs at the highest and lowest elevations was approximately 1 ℃. A comparison of the annual mean LST and observation frequency revealed that geostationary satellite-based LSTs tend to be overestimated because of the lower observation frequency (1/3 of the polar orbit satellite frequency). Overall, the GK-2A AMI LSTs can be used to analyze the spatiotemporal variations in the urban heat island effect and heat waves at fine-scale resolutions, while further topographical correction is recommended to improve their accuracy.
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