| 光谱学与光谱分析 |
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| The New Method Monitoring Crop Water Content Based on NIR-Red Spectrum Feature Space |
| CHENG Xiao-juan1, 2, 3, XU Xin-gang2, 3*, CHEN Tian-en1, YANG Gui-jun2, 3, LI Zhen-hai2 |
1. Geomatics College, Shandong University of Science and Technology, Qingdao 266590, China
2. National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China
3. Key Laboratory of Information Technology in Agriculture, Ministry of Agriculture, Beijing 100097, China |
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Abstract Moisture content is an important index of crop water stress condition, timely and effective monitoring of crop water content is of great significance for evaluating crop water deficit balance and guiding agriculture irrigation. The present paper was trying to build a new crop water index for winter wheat vegetation water content based on NIR-Red spectral space. Firstly, canopy spectrums of winter wheat with narrow-band were resampled according to relative spectral response function of HJ-CCD and ZY-3. Then, a new index (PWI) was set up to estimate vegetation water content of winter wheat by improveing PDI (perpendicular drought index) and PVI (perpendicular vegetation index) based on NIR-Red spectral feature space. The results showed that the relationship between PWI and VWC(vegetation water content) was stable based on simulation of wide-band multispectral data HJ-CCD and ZY-3 with R2 being 0.684 and 0.683, respectively. And then VWC was estimated by using PWI with the R2 and RMSE being 0.764 and 0.764, 3.837% and 3.840%, respectively. The results indicated that PWI has certain feasibility to estimate crop water content. At the same time, it provides a new method for monitoring crop water content using remote sensing data HJ-CCD and ZY-3.
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Received: 2013-07-29
Accepted: 2013-12-18
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Corresponding Authors:
XU Xin-gang
E-mail: xxgpaper@126.com
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