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首页> 外文会议>Workshop on Hyperspectral Image and Signal Processing >ASSESSMENT OF SPECTRAL VARIATION BETWEEN RICE CANOPY COMPONENTS USING SPECTRAL FEATURE ANALYSIS OF NEAR-GROUND HYPERSPECTRAL IMAGING DATA
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ASSESSMENT OF SPECTRAL VARIATION BETWEEN RICE CANOPY COMPONENTS USING SPECTRAL FEATURE ANALYSIS OF NEAR-GROUND HYPERSPECTRAL IMAGING DATA

机译：使用近地高光谱成像数据光谱特征分析评估水稻冠层组件之间的光谱变化

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摘要

Near-ground imaging spectroscopy is emerging as a promising sensing technique that can provide us with very fine spatial resolution imaging data for observing individual canopy components. It is an efficient tool to understand the within-canopy variation in spectral properties of paddy rice and resolve uncertainty sources in the spectroscopic estimation of rice chemistry. Many studies have use the spectral reflectance of the whole canopy for estimating foliar chemical properties (e.g., nitrogen content) but few of them have paid attention to the spectral difference between leaves and panicles. In addition, shaded and sunlit leaves or panicles coexist in the canopy but how their spectral properties differ and the differences change with growth stage are unknown. In this paper, continnum-removed (CR) reflectance spectra of different canopy components and background materials for the whole growing season of paddy rice were examined in the blue and red absorption regions. The results demonstrated that shaded components always showed lower reflectance amplitude but deeper absorption depth than their sunlit counterparts. Leaves exhibited different shapes in the blue absorption region from panicles and duckweeds. The findings are useful for resolving the photosynthetic signals of sunlit and shaded leaves and have great potential for improving the estimation of foliar chemistry from canopy spectral reflectance.
机译：近地面成像光谱仪是一种新兴的有前途的传感技术，可以为我们提供了非常精细的空间分辨率成像数据，观察各盖成分。它是一个有效的工具来理解在水稻化学的分光估计水稻和解决不确定性来源的光谱特性的内篷的变化。许多研究都使用整个树冠的光谱反射率估算叶片的化学特性（例如，氮含量），但很少人关注的叶子和穗之间的光谱差异。此外，阴影和阳光照射的叶片或圆锥花序共存于树冠但如何它们的光谱性质不同，并与生长阶段的不同变化是未知的。在本文中，不同的盖成分和用于水稻的整个生长季的背景材料的continnum-除去（CR）反射光谱在蓝色和红色吸收区进行了检查。结果表明，阴影总是成分显示出较低的反射率的幅度，但更深层次的吸收深度比他们的同行阳光。叶从穗和浮萍蓝色吸收区域表现出不同的形状。这一发现是解决阳光和阴影的光合信号有用的，有从冠层光谱反射率提高叶化学成分的估计潜力巨大。

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