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Vegetation Change in China
NDVI was first ascribed to by Rouse et al. In 1973, Dr. John Rouse commented on its use in his paper entitled "Monitoring vegetation systems in the Great Planes with ERTS".
NDVI is a simple index that is used to analyze vegetation.
This is the most common VI and has a range of -1 to 1.
Normalized Difference Vegetation Index (NDVI)
The meaning of Value of NDVI
NDVI's are calculated by divided the difference of the NIR to the Red by their sum. Calculated NDVI's range in value from 1 for complete vegetation which is very unlikely, to -1 for snow and ice. Normal values range from 0.72 for high vegetation to 0.14 for little to no vegetation.
Surface vegetation cover derived from NDVI over China. Vegetation index are averaged over 1982∼1999
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