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Sagot :
Absorb blue (400–500 nm) with red color whenever the absorbance level of spectrum is that major with pigment from a organism found on the earth.
The existence or absence of particular absorption characteristics on the surface, as well as their location and form, all affect the spectral reflectance signatures. For photosynthesis, chlorophyll pigments a and b preferentially absorb blue (400–500 nm) and red (600–700 nm) wavelengths. The "green" wavelengths (500–600 nm) experience less absorption, giving off the lush green color of healthy flora. Carotene, a yellow to orange-red pigment, strongly absorbs blue wavelengths (400–500 nm).
The red and blue pigment xanthophyll, which gives deciduous leaves their varied hues, absorbs heavily in the 400–500 nm region. While leaf absorption is minimal, leaf pigments and cellulose are transparent to near-infrared wavelengths (700–1300 nm). Depending on the structural properties of the leaf, the majority of the energy is transmitted and reflected, creating a high near-infrared (NIR) plateau. The red edge, which is used to identify plant stress, is the abrupt rise in reflectance between the red and NIR areas. The soil and leaf water absorption dominates the middle-infrared (MIR) region (1300-2500 nm), especially between 1400 and 1900 nm, with reflectance rising as leaf liquid water content falls.
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