| 光谱学与光谱分析 |
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| Multi-Layer Perceptron Neural Network Based Algorithm for Simultaneous Retrieving Temperature and Emissivity from Hyperspectral FTIR Data |
| CHENG Jie1,3,XIAO Qing1,LI Xiao-wen1,2,LIU Qin-huo1,3,DU Yong-ming1,2 |
1. State Key Laboratory of Remote Sensing Science, Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University, Beijing 100101, China
2. Center for Remote Sensing and GIS, Beijing Normal University, Beijing 100875, China
3. Graduate School of Chinese Academy of Sciences, Beijing 100039, China |
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Abstract The present paper firstly points out the defect of typical temperature and emissivity separation algorithms when dealing with hyperspectral FTIR data: the conventional temperature and emissivity algorithms can not reproduce correct emissivity value when the difference between the ground-leaving radiance and object’s blackbody radiation at its true temperature and the instrument random noise are on the same order, and this phenomenon is very prone to occur rence near 714 and 1 250 cm-1 in the field measurements. In order to settle this defect, a three-layer perceptron neural network has been introduced into the simultaneous inversion of temperature and emissivity from hyperspectral FTIR data. The soil emissivity spectra from the ASTER spectral library were used to produce the training data, the soil emissivity spectra from the MODIS spectral library were used to produce the test data, and the result of network test shows the MLP is robust. Meanwhile, the ISSTES algorithm was used to retrieve the temperature and emissivity form the test data. By comparing the results of MLP and ISSTES, we found the MLP can overcome the disadvantage of typical temperature and emisivity separation, although the rmse of derived emissivity using MLP is lower than the ISSTES as a whole. Hence, the MLP can be regarded as a beneficial complementarity of the typical temperature and emissivity separation.
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Received: 2007-01-08
Accepted: 2007-04-06
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Corresponding Authors:
CHENG Jie
E-mail: brucechan2003@126.com
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