NTA-NET (UGC-NET) Geography (80) Cartography-Digital Image Processing, Remote Sensing and Big Data Study Material (Page 10 of 11)

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Spectral Indices

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For decades, various spectral indices have been used by scientists to predict, model, or infer surface processes to assess and monitor several different land change processes such as

  • Vegetation health and status
  • Burned Area
  • Fire Severity, etc.

This section describes the spectral response of different earth surface features (vegetation, soil, and water) and various indices used in the field remote sensing.

Various spectral indices that are used to aid the interpretation of the imagery is broadly advanced in the following four stages:

  • Initially intrinsic indices were developed from simple band rati…

… (617 more words, 40 figures) …

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Effects of Soil Background on Vegetation Index

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  • Until the soil is fully covered with the vegetation the soil background will influence the vegetation index. For incomplete canopies, the wetting of previously dry soils (and vice versa) can cause a change in vegetation index. The change is further complicated by the fact that transmission of light through vegetation is considerably greater in NIR than in R band.
  • Both the ratio and the linear classes of vegetation index rely on the existence of the soil baseline in the red and NIR wavelength space for soil no…

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