From the figure, it can be seen that the hyperspectral reflectance of winter wheat canopy mainly showed a trend of first increasing and then decreasing with the increasing of wavelength.
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Hyperspectral estimation of chlorophyll density in winter wheat using fractional-order derivative combined with machine learning.
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The sentences
In addition, in the range of 400-700 nm, samples with different Log(ChD) exhibited an overall trend of decreasing spectral reflectance with increasing Log(ChD), while in the range of 740-1800 nm, it showed an increasing trend with increasing Log(ChD).
In terms of details, there was a clear trend of gradual decreasing in the range of 0 to 1.0-order, and the smaller the order, the greater the magnitude of the decrease.