NASA NTRS · 19920034482
Calculating the vegetation index faster
Abstract
The NIR versus red 'infrared percentage vegetation index', NIR/(NIR + Red), is functionally and linearly equivalent to the normalized difference vegetation index, (NIR-Red)/(NIR + Red). Advantageously, it is both computationally faster and never negative.
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Crippen, Robert E.. 1990-10-01. Calculating the vegetation index faster. https://ntrs.nasa.gov/citations/19920034482
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