Wheat lodging monitoring using polarimetric index from RADARSAT-2 data

文献类型： 外文期刊

第一作者： Yang, Hao

作者： Yang, Hao;Chen, Erxue;Li, Zengyuan;Zhao, Lei;Yang, Hao;Zhao, Chunjiang;Yang, Guijun;Pignatti, Stefano;Casa, Raffaele

作者机构：

关键词： Wheat lodging;Radarsat-2;Polarimetric feature;Multi-temporal;Monitoring;Disaster

期刊名称：INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION （ 影响因子：5.933； 五年影响因子：6.225 ）

ISSN： 0303-2434

年卷期： 2015 年 34 卷

页码：

收录情况： SCI

摘要： The feasibility of monitoring lodging of wheat fields by exploiting fully polarimetric C-band radar images has been investigated in this paper. A set of backscattering intensity features and polarimetric features, derived by target decomposition techniques, was extracted from 5 consecutive Radarsat-2 images. The temporal evolutions of these features of lodging wheat fields were investigated as a function of DAS (day after sowing) during the entire growing season. The temporal behavior was compared between typical lodging fields and normal fields in different growing stages. It was found that polarimetric feature from synthetic aperture radar (SAR) data was very sensitive to wheat lodging. Then a method called polarimetric index, availing the sensitivity of polarimetry to the structure, was put forward to monitor wheat lodging. The method was validated by two sets of in situ data collected in Shangkuli Farmland area, Inner Mongolia, China, at heading and ripe stages of spring wheat. Almost all the lodging fields were successfully distinguished from normal fields. Furthermore, the result revealed that the polarimetric index can reflect the intrinsic feature of lodging wheat with good anti-inference ability such as wheat growth difference. While optical sensors relied on its spectral features to monitor crop lodging, the proposed method based on radar data utilized polarimetric features to monitor crop lodging. (C) 2014 Elsevier B.V. All rights reserved.

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