Retrieval of Land Surface Temperature over Mountainous Areas Using Fengyun-3D MERSI-II Data
文献类型: 外文期刊
第一作者: Xue, Yixuan
作者: Xue, Yixuan;Zhu, Xiaolin;Wu, Zihao;Duan, Si-Bo
作者机构:
关键词: mountainous surface temperature; FY-3D MERSI-II; adjacent terrain radiation
期刊名称:REMOTE SENSING ( 影响因子:5.0; 五年影响因子:5.6 )
ISSN:
年卷期: 2023 年 15 卷 23 期
页码:
收录情况: SCI
摘要: Land surface temperature (LST) is an important physical quantity in the energy exchange of hydrothermal cycles between the land and near-surface atmosphere at regional and global scales. However, the traditional thermal infrared transfer equation (RTE) and LST retrieval algorithms are always based on the underlying assumptions of homogeneity and isotropy, which ignore the terrain effect influence of a heterogeneous topography. It can cause significant errors when traditional RTE and other algorithms are used to retrieve LST in such mountainous research. In this study, the mountainous thermal infrared transfer model considering terrain effect correction is used to retrieve the mountainous LST using FY-3D MERSI-II data, and the in situ site data are simultaneously utilized to evaluate the performance of the iterative single-channel algorithm. The elevation of this study region ranges from 500 m to 2200 m, whereas the minimum SVF can reach 0.75. Results show that the spatial distribution of the retrieved LST is similar to topographic features, and the LST has larger values in the lower valley and smaller values in the higher ridge. In addition, the overall bias and RMSE between the retrieved LSTs and five in situ stations are respectively -0.70 K and 2.64 K, which demonstrates this iterative single-channel algorithm performs well in taking into account the terrain effect influence. Accuracy of the LST estimation is meaningful for mountainous ecological environmental monitoring and global climate research. Such an adjacent terrain effect correction should be considered in future research on complex terrains, especially with high spatial resolution TIR data.
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