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首页> 外文期刊>Computers and Electronics in Agriculture >Reducing the influence of solar illumination angle when using active optical sensor derived NDVIAOS to infer fAPAR for spring wheat (Triticum aestivum L.)
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Reducing the influence of solar illumination angle when using active optical sensor derived NDVIAOS to infer fAPAR for spring wheat (Triticum aestivum L.)

机译：使用活性光学传感器衍生Ndviaos时，降低太阳照射角度的影响，以推断春小麦（Triticum aestivum L）的FAPAR

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摘要

In recent years, the normalized difference vegetation index (NDVI), derived from active optical sensors (AOS) is being increasingly used to estimate the fraction of absorbed photosynthetically active radiation (fAPAR), a key variable in plant productivity modelling. The fAPAR of a plant canopy is dependent on the solar illumination angle. On the other hand AOSs when used to measure NDVIAOS are responding only to their integrated light source. The consequence is the NDVIAOS-fAPAR relationship is sensitive to solar illumination angle. In this work the effect of aligning the AOS view angle with the solar illumination angle on the NDVIAOS-fAPAR relationship is examined for a range of solar elevation angles (theta(delta e)) of 40 degrees, 55 degrees and 70 degrees, for spring wheat (Triticum aestivum L., bread var. Crusader), at four different growth stages (Zadoks 26, 29, 39 and 47). At each growth stage the fAPAR - NDVIAOS relationship was linear (R-2 &= 0.80). The regression lines exhibited similar slopes with varying solar illumination angle, but with some variation in intercept. By aligning the AOS sensor view angle to the solar illumination angle there was no significant difference in the NDVIAOS-fAPAR relationship between Zadoks 26 and 29 nor between Zadoks 39 and 47. The presence of senescent leaves at later stages of crop growth was noted to influence the fAPAR - NDVIAOS relationship, which should be considered when applying a unique algorithm for all stages of crop growth.
机译：近年来，衍生自活性光学传感器（AOS）的归一化差异植被指数（NDVI）越来越多地用于估计吸收的光合作用辐射（FAPAR）的分数，植物生产率建模中的一个关键变量。植物冠层的FAPAR取决于太阳能照明角度。另一方面，当用于测量NDVIAOS时，AOSS仅响应它们的集成光源。结果是NDVIAOS-FAPAR关系对太阳能照射角度敏感。在这方面，在40度，55度和70度的一系列太阳仰角（θ（delta e））范围内，检查将AOS视角与太阳能照射角度对准与太阳能照射角度的影响。小麦（Triticum aestivum L.，Broad Var。Crusader），四种不同的生长阶段（Zadoks 26,29,39和47）。在每个生长阶段，FAPAR - NDVIAOS关系是线性的（R-2＆amp; = 0.80）。回归线表现出类似的太阳照射角度的类似斜率，但是截距有一些变化。通过将AOS传感器视角与太阳能照射角对准，Zadoks 26和29之间的Ndviaos-Fapar关系没有显着差异，也不是Zadoks 39和47.衰老叶在后来的作物生长阶段的存在受到影响FAPAR - NDVIAOS关系，应在为所有作物生长阶段应用独特的算法时考虑。

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