Describe spectral signatures of soils, minerals and rocks and the factors influencing it. Support your answer with neat well labelled diagrams, wherever required.

Spectral signatures are the unique patterns of reflectance or emittance of electromagnetic radiation by objects on the Earth's surface, which can be detected by remote sensing instruments. These signatures are primarily influenced by the material's composition, structure, moisture content, and surface roughness. In the context of remote sensing, soils, minerals, and rocks exhibit distinct spectral signatures, which can be used to identify and study their properties.

### Spectral Signatures of Soils

Soil spectral signatures are influenced by the mineral composition, organic content, moisture content, and surface roughness. In general, soils tend to have relatively broad, featureless spectra in the visible to near-infrared (VNIR) region. The reflectance of soils decreases as the wavelength increases in this region, with soil properties affecting the degree of reflectance.

- Composition: The mineral content of soil significantly affects its reflectance. Clay-rich soils tend to have lower reflectance in the visible region compared to sandy ______ ________ _________ ___ ___ ______ ______ ____ ________ ___ _________ ________.
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