EVI

The EVI operator algorithm computes the Enhanced Vegetation Index from a given product.

The EVI results from the following equation:

EVI = g * (N - R) / (N + c1 * R - c2 * B + l)

, where:

The bands are:

- B is the Blue band
- R is the Red band
- N is the NIR band

and the coefficients are:

- g is the Gain factor coefficient
- l is the Canopy background adjustment coefficient
- c1 is the Coefficient 1 for the aerosol resistance term coefficient
- c2 is the Coefficient 2 for the aerosol resistance term coefficient

EVI-Flags

Also the processor computes an additional flags band called 'evi_flags' with the following bit coding:

Bit Position	Description
Bit 0	The computed value for EVI is NAN or is Infinite
Bit 1	The computed value for EVI is less than -1 (minus one)
Bit 2	The computed value for EVI is greater than 1 (one)