Spectral reflectance curve shows the relationship of electromagnetic spectrum with the associated percent reflectance for any given material.
For any given material, the amount of solar radiation that reflects, absorbs, or transmits varies with wavelength. This important property of matter makes it possible to identify different substances or classes and separate them by their spectral signatures.
In the fig 1.13, at some wavelength, dry soil reflects more energy than green vegetation does. In principal, we can recognize various kinds of surface materials and distinguish them from each other by these differences in reflectance.
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