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Unformatted text preview: The NDVI Index is then computed using the following formula NDVI = (NIR — VIS)/(NIR + VIS) where NIR is the near infrared radiation and VIS is the visible radiation. The higher the index, the greener is the land, while a index close to zero means no vegetation. Figure 2 – NDVI physical meaning - http://earthobservatory.nasa.gov/Features/MeasuringVegetation/measuring_vegetation_2.php The idea behind this index is that if the difference between NIR and VIS is higher, it means that the selected pixel (the resolution is 1 km x 1 km) is densely green, while if this difference is lower (low absorption of visible light), then the vegetation is sparse or not present (grassland, tundra, desert). REFERENCES: http://earthobservatory.nasa.gov/Features/MeasuringVegetation/measuring_vegetation_2.php http://earthobservatory.nasa.gov/GlobalMaps/view.php?d1=MOD13A2_M_NDVI...
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This note was uploaded on 01/08/2012 for the course MPO 551 taught by Professor Zhang,c during the Summer '08 term at University of Miami.
- Summer '08