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Spectral signatures refer to the unique way in which different Earth surface features reflect or emit electromagnetic radiation across various wavelengths. Each type of surface—such as water bodies, vegetation, bare soil, snow, and urban materials—interacts differently with sunlight and other sources of radiation, producing a distinct pattern that can be detected using remote sensing instruments. For instance, healthy vegetation typically shows low reflectance in the visible spectrum, especially in blue and red wavelengths, __________ ______ _____ ________ __________ ___ ________ _________ _________ ___ ____ __________.
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