Normalized Difference Vegetation Index

Question 1

What is this Vegetation Index about ?

Answer 1

It quantifies vegetation by measuring differences between

a) Near infrared (which vegetation reflects) and
b) Red light (which Vegetation absorbs)

Question 2

Range ?

Answer 2

-1 to +1

Question 3

Prediction from this range ?

Answer 3

High NDVI values - Healthier vegetation and viceversa

Question 4

Uses ?

Answer 4

1) In agriculture, farmers use for precision farming to measure biomass
2) Forestry - foresters use to quantify forest supply and leaf area index
3) NASA calls NDVI as a good indicator of drought
4) Elephants tracking using the vegetation they consume