Vegetation index

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Normal recording (VIS) and infrared recording (IR, right)
Difference image IR − VIS

Vegetation indices are one of the primary sources for observing and analyzing the earth's surface and especially vegetation . They use the red and near-infrared spectral range . Portable hand-held devices or aircraft or satellite-based multispectral sensors can be used for recording .

background

Vegetation indices make use of the strong increase in the degree of reflection of photosynthetic vegetation from the red (approx. 630–690 nm) to the near-infrared (approx. 750–900 nm) range. Chlorophyll , better: mesophyll, reflects about six times more strongly in the near infrared than in the visible spectrum.

Published indices

Example of NDVI by Landsat 8 for the urban area of Ponta Grossa , southern Brazil
  • VI ≈ DVI " D ifference V egetation I ndex" (NIR-Red) (Lillesand & Kiefer, 1987 (VI); Richardson & Everitt, 1992 (DVI)):
  • RVI " R atio V egetation I ndex" (NIR / Red) (Jordan, 1969)
  • WDVI
  • NDVI " N ormalized D ifferenced V egetation I ndex"
  • SAVI family " S oil A djusted V egetation I ndex"
  • EVI " E nhanced V egetation I ndex"
  • GRABS " GR eeness A bove B are S oil" (Hay et al., 1979)
  • PVI " P erpendicular V egetation I ndex" (Richardson & Wiegand, 1977)

Other spectral indices

  • Tasseled cap
  • VARI (Visible Atmospherically Resistant Index) (Gittelson et al., 2002)
  • NDBI (Normalized Difference Built-up Index) (Zha et al., 2003)
  • AFRI (Aerosol Free Vegetation Index) (Karnieli et al., 2001)
  • ARVI (Aerosol Resistant Vegetation Index)
  • MSI (Moisture Stress Index) (Rock et al., 1986)
  • LWCI (Leaf Water Content Index) (Hunt et al., 1987)

See also

Web links