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Spectral signatures are unique patterns of reflectance or emittance of electromagnetic radiation from different Earth surface features across various wavelengths. Every material on Earth’s surface—such as water, vegetation, soil, snow, and urban structures—interacts with sunlight and emits or reflects radiation differently, creating a distinct spectral signature. These signatures are crucial for remote sensing and climate change assessment tools, as they help in identifying and monitoring changes in land cover and surface properties over time. Vegetation, for instance, has a well-known spectral signature characterized by strong absorption in the visible ______ ________ _______ ______ _________.
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