Estimating the Surface Broadband Emissivity of Deserts in Xinjiangbase on MODIS and FTIR Data

Li Huoqing, Wu Xinping, Ali Mamtimin, Huo Wen, Yang Xinghua, Yang Fan, He Qing, Liu Yongqiang

doi:10.7522/j.issn.1000-694X.2015.00270

Journal of Desert Research >

2017 , Vol. 37 >Issue 3: 523 - 529

DOI: https://doi.org/10.7522/j.issn.1000-694X.2015.00270

Estimating the Surface Broadband Emissivity of Deserts in Xinjiangbase on MODIS and FTIR Data

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1. College of Resources and Environmental Sciences, Xinjiang University, Urumqi 830046, China;
2. Key Laboratory of City Intellectualizing and Environment Modeling, Xinjiang University, Urumqi 830046, China;
3. Ministry of Education Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, China;
4. Tazhong Weather Station of Qarqan, Qarqan 841900, Xinjiang, China;
5. Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China

Received date: 2015-09-06

Revised date: 2015-11-30

Online published: 2017-05-20

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Abstract

We proposed an optimal model to estimate the surface broadband emissivity of deserts in Xinjiang for the spectral domains 8-13.5 μm by the FTIR and MODIS data. Firstly, using the broadband emissivity spectral data measured by Fourier Transform Infrared spectrometer (FTIR) over Taklimakan Desert, and the MODIS data during same period in three thermal infrared channels 29 (8.4-8.7 μm), 31 (10.78-11.28 μm) and 32 (11.77-12.27 μm) and one near-infrared channel 7 (2.105-2.155 μm), an empirical regression equation to convert these spectral emissivity and reflectance to broadband emissivity was developed. The accuracy of the equation was verified by the observed FTIR data and the MODIS spectral library data, and the root mean square errors (RMSE) were 0.0041 and 0.0081, respectively. Secondly, the optimal equation was applied to build a distribution map of emissivity of four deserts in Xinjiang based on MODIS data. The emissivity in the Taklimakan Desert and Culukekum Desert is in the range of 0.850-0.915. Because there is dry and stable climate, the broadband emissivity is fairly well-distributed in the deserts. The emissivity in the Gurbantonggut Desert is in the range of 0.890-0.915. Because the land surface is influenced by vegetation and surface water, so its emissivity spatial distribution is not uniform. The emissivity in the Kumtagh Desert is in the range of 0.860-0.910, and its distribution is similar to its plume surface.

Key words： broadband emissivity; MODIS; FTIR; spectral library; desert; Xinjiang

Cite this article

Li Huoqing, Wu Xinping, Ali Mamtimin, Huo Wen, Yang Xinghua, Yang Fan, He Qing, Liu Yongqiang . Estimating the Surface Broadband Emissivity of Deserts in Xinjiangbase on MODIS and FTIR Data[J]. Journal of Desert Research, 2017 , 37(3) : 523 -529 . DOI: 10.7522/j.issn.1000-694X.2015.00270

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