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Evaluation of hyperspectral LiDAR for monitoring rice leaf nitrogen by comparison with multispectral LiDAR and passive spectrometer

机译:与多光谱LiDAR和无源光谱仪比较评价高光谱LiDAR监测稻叶氮

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摘要

Fast and nondestructive assessment of leaf nitrogen concentration (LNC) is critical for crop growth diagnosis and nitrogen management guidance. In the last decade, multispectral LiDAR (MSL) systems have promoted developments in the earth and ecological sciences with the additional spectral information. With more wavelengths than MSL, the hyperspectral LiDAR (HSL) system provides greater possibilities for remote sensing crop physiological conditions. This study compared the performance of ASD FieldSpec Pro FR, MSL, and HSL for estimating rice (Oryza sativa) LNC. Spectral reflectance and biochemical composition were determined in rice leaves of different cultivars (Yongyou 4949 and Yangliangyou 6) throughout two growing seasons (2014–2015). Results demonstrated that HSL provided the best indicator for predicting rice LNC, yielding a coefficient of determination (R2) of 0.74 and a root mean square error of 2.80 mg/g with a support vector machine, similar to the performance of ASD (R2 = 0.73). Estimation of rice LNC could be significantly improved with the finer spectral resolution of HSL compared with MSL (R2 = 0.56).
机译:叶氮浓度(LNC)的快速和无损评估对于作物生长诊断和氮管理指南至关重要。在过去的十年中,多光谱LiDAR(MSL)系统通过附加的光谱信息促进了地球和生态科学的发展。高光谱LiDAR(HSL)系统具有比MSL更多的波长,为遥感作物生理状况提供了更大的可能性。这项研究比较了ASD FieldSpec Pro FR,MSL和HSL在估算水稻LNC方面的性能。在两个生长季节(2014-2015年),测定了不同品种(永优4949和杨良优6)的水稻叶片的光谱反射率和生化组成。结果表明,HSL提供了预测大米LNC的最佳指标,用支持向量机得出的测定系数(R 2 )为0.74,均方根误差为2.80μmg/ g。 ASD的性能(R 2 = 0.73)。与MSL相比,HSL的光谱分辨率更高,水稻LNC的估算值可以得到显着改善(R 2 = 0.56)。

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