| 光谱学与光谱分析 |
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| Monitoring Freeze Stress Levels on Winter Wheat from Hyperspectral Reflectance Data Using Principal Component Analysis |
| WANG Hui-fang1, 2, WANG Ji-hua2, DONG Ying-ying2, GU Xiao-he2, HUO Zhi-guo1* |
1. Chinese Academy of Meteorological Science, Beijing 100081, China
2. Beijing Research Centre for Information Technology in Agriculture, Beijing 100097, China |
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Abstract In order to detect the freeze injury stress level of winter wheat growing in natural environment fast and accurately, the present paper takes winter wheat as experimental object. First winter wheat canopy hyperspectral data were treated with resampling smooth. Second hyperspectral data were analyzed based on principal components analysis (PCA), a freeze injury inversion model was established, stems survival rate was dependent, and principal components of spectral data were chosen as independent variables. Third, the precision of the model was testified. The result showed that the freeze injury inversion model based on 6 principal components can estimate the winter wheat freeze injury accurately with the coefficient of determination (R2) of 0.697 5, root mean square error (RMSE) of 0.184 2, and the accuracy of 0.697 5. And the model was verified. It can be concluded that the PCA technology has been shown to be very promising in detecting winter wheat freeze injury effectively, and provide important reference for detecting other stress on crop.
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Received: 2013-07-17
Accepted: 2013-11-18
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Corresponding Authors:
HUO Zhi-guo
E-mail: huozhigg@cams.cma.gov.cn
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