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A spectral signature is the unique pattern of electromagnetic energy reflected, absorbed, or emitted by an object at different wavelengths of the electromagnetic spectrum. Every natural and artificial object interacts differently with solar radiation depending on its physical and chemical properties. These variations in reflectance across wavelengths create a characteristic curve known as the spectral signature. In remote sensing, spectral signatures are used to identify, classify, and distinguish different land cover features such as vegetation, soil, water bodies, rocks, and urban areas. Spectral signatures are recorded by sensors mounted on satellites, aircraft, or drones and are essential for image interpretation and digital classification. The spectral signature of vegetation is one of the most distinctive and widely studied signatures in remote sensing. Healthy green vegetation absorbs most of the blue (0.45–0.52 µm) and red (0.63–0.69 µm) wavelengths due to the presence of chlorophyll pigments, which are responsible for photosynthesis. As a result, reflectance in these regions is low. Green light (0.52–0.60 µm) is reflected more strongly, giving vegetation its green appearance. In the near-infrared (NIR) region (0.70–1.30 µm), healthy vegetation reflects a very high percentage of radiation _______ ________ ______ _______ _______ ___.
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