IGNOU MGG 12 2026 2027 - What is spectral signature? Discuss the spectral signature of ve

Question

What is spectral signature? Discuss the spectral signature of vegetation and soil with
suitable examples and diagrams.

31 Jul 2026

Answer :

Word Count : 479

A spectral signature is the characteristic pattern of reflectance or emission of electromagnetic radiation shown by an object at different wavelengths. Every material interacts with electromagnetic energy in a distinct manner because of its physical and chemical properties. The graph representing the variation of spectral reflectance with wavelength is called its spectral signature or spectral response curve. Spectral signatures are fundamental in remote sensing because they help identify, classify and differentiate objects on the Earth's surface. The spectral signature of vegetation is mainly influenced by leaf pigments, cellular structure, water content and plant health. Healthy green vegetation has a distinctive response in the visible, near-infrared (NIR), and shortwave-infrared (SWIR) regions. In the blue and red portions of the visible spectrum, vegetation absorbs much of the incoming radiation because chlorophyll absorbs energy for photosynthesis. In contrast, reflectance is relatively higher in the green region, which is why healthy vegetation

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