IGNOU MEV 024 2025 - Spectral signatures of common earth surface features

Question

Spectral signatures of common earth surface features

11 Sep 2025

Answer :

Word Count : 311

Spectral signatures represent the unique way in which different earth surface features absorb, reflect, and emit electromagnetic radiation across various wavelengths. In climate change assessment tools, spectral signatures play a vital role because they allow remote sensing technologies to identify, monitor, and analyze environmental changes with high accuracy. Each feature such as vegetation, water, soil, snow, and urban surfaces interacts differently with radiation, which helps in distinguishing them and understanding their response to climate variability. Vegetation shows high reflectance in the near-infrared region and strong absorption in the red and blue wavelengths due to chlorophyll. This property enables tools like

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