NDR (Normalized Difference RedEdge)

Normalized difference red edge index (NDRE for short) is a method of measuring the amount of chlorophyll in the plants. The best timing to apply NDRE is mid-to-late growing season when the plants are mature and ready to be harvested. At this point, other indices would be less effective to use.

NDRE = NIR - RedEdge / NIR + RedEdge