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+ What is the Normalized Vegetation Index?

This is an index of plant “greenness” of photosynthetic activity that utilizes the visible and near-infrared bands of the electromagnetic spectrum. It is a commonly used remote-sensing index used as a proxy for vegetation health. Written mathematically it is:

NDVI = (Near Infrared – Red) / (Near Infrared + Red)

See this NASA Earth Observatory description for more information.