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NDVI: What It Is and What It Measures. Danielle Williams. What is NDVI?. Normalized difference vegetation index mathematical formula derived to form a single spectral based number more sensitive than just a single wavelength ratio - no units. What does NDVI measure? .

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Presentation Transcript
what is ndvi
What is NDVI?
  • Normalized difference vegetation index
  • mathematical formula derived to form a single spectral based number
    • more sensitive than just a single wavelength
  • ratio - no units
what does ndvi measure
What does NDVI measure?
  • “greenness” i.e. chlorophyll content
      • correlated with biomass
      • represent N status of plant
slide4

How does it work?

  • Light
  • -absorbed
  • -transmitted
  • -reflected
  • Different pigments stimulated by
  • different parts of light spectrum
ndvi ir red ir red
NDVI= IR-Red / IR+ Red

IR 750-1300 nm

Red 600-700nm

Chlorophyll greenness of leaf

- activity @ 645 and 663nm

Reflected green color peaks

at 550nm

uses of ndvi
Uses of NDVI
  • water stress
  • N stress/uptake
  • P stress/ uptake
  • Anything if it is the limiting/excess factor
  • disease?
factors affecting ndvi
Factors affecting NDVI
  • leaf morphology
  • growth stage (Sembiring et al, 2000)
  • variety (Sembiring et al. ,2000)
  • crop
  • row spacing/planting density

(Lukina et al, 2000)

  • soil type (Heilman and Kress, 1987)
  • canopy cover
  • environmental stress
why use ndvi
Why use NDVI?
  • indirect measurement
    • less time
    • more cost effective
    • more precise application of fertilizer
    • unbiased
future research
Future research
  • other nutrients other than N
  • calibrations for crops
  • disease
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