3.2.2 - Near infrared (NIR)

The optical properties in the near infrared spectral domain (0.701 μm 1.3 μm) are explained by leaf structure. The spongy mesophyll cells located in the interior or back of the leaves reflects NIR light, much of which emerges as strong reflection rays. The intensity of NIR reflectance is commonly greater than most inorganic materials, so vegetation appears bright in NIR wavelengths.


Figure 3.5 – Reflectance spectrum for green grass, for NIR wavelengths