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- W2893171107 abstract "Relationships between vegetation indices (VIs) and leaf area index (LAI) tend to saturate in the nadir direction, and vary with crop canopy structure and view zenith angles (VZAs). The objective of this paper was to improve the monitoring accuracy and angular stability of VIs for estimating LAI using multiangular remote sensing data. The relationship between LAI and ground-based hyperspectral spectral reflectance was quantified in winter wheat (Triticum aestivum L.) exhibiting erectophile and planophile growth habits. To further reduce the saturation, species specificity, and angular sensitivity, we developed a saturation factor (SF), based on near-infrared and green bands. Multiplying all VIs by SF greatly improved the association with LAI across all VZAs (R <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sup> = 0.73-0.82). Most VI × SF values, particularly optimized soil-adjusted VI × SF, were able to construct universal algorithms across VZAs for accurate estimation of LAI due to the sensitivity of SF to LAI in a dense canopy, and the insensitivity of SF to view effects with larger VZAs. This approach is also promising for the exploitation of multiangular satellite data for the design and calibration of nonview-angle-corrected spectral reflectance, for which the sensor is only deployed at fixed observation direction." @default.
- W2893171107 created "2018-10-05" @default.
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- W2893171107 date "2019-03-01" @default.
- W2893171107 modified "2023-10-10" @default.
- W2893171107 title "Reduced Prediction Saturation and View Effects for Estimating the Leaf Area Index of Winter Wheat" @default.
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- W2893171107 doi "https://doi.org/10.1109/tgrs.2018.2868138" @default.
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