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Development, evaluation and application of a spectral knowledge base to detect yellow rust in winter wheat

文献类型： 外文期刊

作者： Zhang, Jingcheng 1 ; Huang, Wenjiang 1 ; Li, Jiangyuan 1 ; Yang, Guijun 1 ; Luo, Juhua 1 ; Gu, Xiaohe 1 ; Wang, Jihua 1 ;

作者机构： 1.Natl Engn Res Ctr Informat Technol Agr, Beijing 100097, Peoples R China

2.Zhejiang Univ, Inst Agr Remote Sensing & Informat Syst Applicat, Hangzhou 310029, Zhejiang, Peoples R China

3.Tongji Univ, Sch Elect & Informat Engn, Shanghai 201800, Peoples R China

4.Shanxi Normal Univ, Sch Engn, Linfen 041000, Peoples R China

关键词： Yellow rust; Pushbroom imaging spectrometer (PHI); Environment and disaster reduction small satellites (HJ-1A/B); Mahalanobis distance; Spectral angle (SA)

期刊名称：PRECISION AGRICULTURE （ 影响因子：5.385； 五年影响因子：5.004 ）

ISSN： 1385-2256

年卷期： 2011 年 12 卷 5 期

页码：

收录情况： SCI

摘要： In most cases, statistical models for monitoring the disease severity of yellow rust are based on hyperspectral information. The high cost and limited cover of airborne hyperspectral data make it impossible to apply it to large scale monitoring. Furthermore, the established models of disease detection cannot be used for most satellite images either because of the wide range of wavelengths in multispectral images. To resolve this dilemma, this paper presents a novel approach by constructing a spectral knowledge base (SKB) of diseased winter wheat plants, which takes the airborne images as a medium and links the disease severity with band reflectance from environment and disaster reduction small satellite images (HJ-CCD) accordingly. Through a matching process with a SKB, we estimated the disease severity with a disease index (DI) and degrees of disease severity. The proposed approach was validated against both simulated data and field surveyed data. Estimates of DI (%) from simulated data were more accurate, with a coefficient of determination (R (2)) of 0.9 and normalized root mean square error (NRMSE) of 0.2. The overall accuracy of classification reached 0.8, with a kappa coefficient of 0.7. Validation of the estimates against field measurements showed that there were some errors in the DI value with the NRMSE close to 0.5. The result of the classification was more encouraging with an overall accuracy of 0.77 and a kappa coefficient of 0.58. For the matching process, Mahalanobis distance performed better than the spectral angle (SA) in all analyses in this study. The potential of SKB for monitoring the incidence and severity of yellow rust is illustrated in this study.

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