Mid-Infrared Emissivity Retrieval from Nighttime Sentinel-3 SLSTR Images Combining Split-Window Algorithms and the Radiance Transfer Method

Xin Ye, Huazhong Ren, Pengxin Wang, Zhongqiu Sun () and Jian Zhu
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Xin Ye: College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China
Huazhong Ren: Institute of Remote Sensing and Geographic Information System, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Pengxin Wang: College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China
Zhongqiu Sun: Academy of Forestry Inventory and Planning, National Forestry and Grassland Administration, Beijing 100714, China
Jian Zhu: College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China

IJERPH, 2022, vol. 20, issue 1, 1-14

Abstract: Land surface emissivity is a key parameter that affects energy exchange and represents the spectral characteristics of land cover. Large-scale mid-infrared (MIR) emissivity can be efficiently obtained using remote sensing technology, but current methods mainly rely on prior knowledge and multi-temporal or multi-angle remote sensing images, and additional errors may be introduced due to the uncertainty of external data such as atmospheric profiles and the inconsistency of multiple source data in spatial resolution, observation time, and other information. In this paper, a new practical method was proposed which can retrieve MIR emissivity with only a single image input by combining the radiance properties of TIR and MIR channels and the spatial information of remote sensing images based on the Sentinel-3 Sea and land surface temperature radiometer (SLSTR) data. Two split-window (SW) algorithms that use TIR channels only and MIR and TIR channels to retrieve land surface temperature (LST) were developed separately, and the initial values of MIR emissivity were obtained from the known LST and TIR emissivity. Under the assumption that the atmospheric conditions in the local area are constant, the radiance transfer equations for adjacent pixels are iterated to optimize the initial values to obtain stable estimation results. The experimental results based on the simulation dataset and real SLSTR images showed that the proposed method can achieve accurate MIR emissivity results. In future work, factors such as angular effects, solar radiance, and the influence of atmospheric water vapor will be further considered to improve performance.

Keywords: middle infrared; land surface emissivity; thermal infrared; remote sensing; split-window algorithm; Sentinel-3 SLSTR (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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