Tucker et al (1991) used changes in normalized difference vegetation index (NDVI) for the Sahel region of Africa to show that the southern boundary of the Sahara moves southward in years of low rainfall and retreats northward in years of higher ...
Time series of the normalized difference vegetation index (NDVI), calculated from the red and infrared spectral reflectance measurements of the AVHRR sensor, ...
The equations simply solve for the normalized difference in slope and aspect angles between the two planes.
 See also: Information, Area, Region, Cover, Analysis
  
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