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Spectral signatures refer to the specific pattern of reflectance or emittance of electromagnetic radiation by different Earth surface features across various wavelengths. These signatures are detected using remote sensing instruments and are fundamental in climate change assessment tools, enabling identification and monitoring of changes in land cover, vegetation, water bodies, ice cover, and urban surfaces over time. Each Earth surface feature interacts differently with sunlight and emits a unique spectral response across different bands of the electromagnetic spectrum (especially visible, near-infrared, and shortwave infrared). These differences are captured as spectral signatures. They help differentiate ____ ____ __________ _________ _________ _________ __________ ___.
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