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en.wikipedia.org/wiki/Normalized_difference_vegetation_index

The normalized difference vegetation index (NDVI) is a simple graphical indicator that can be ... The earliest reported use of NDVI in the Great Plains study was in 1973 by Rouse et al. (Dr. John Rouse was the Director of the Remote Sensing ...

www.ncbi.nlm.nih.gov/pmc/articles/PMC3965234

Nov 5, 2007 ... On the other hand, NDVI is defined by Rouse et al. .... ρ nir T ρ red T = R V I T nir − red = R V I O nir − red ( cos i ⋅ cos e ) k red − k nir. (18).