The MGRVI operator algorithm computes the Modified Green Red Vegetation Index from a given product.

The MGRVI results from the following equation:

MGRVI = (pow(G , 2.0) - pow(R , 2.0)) / (pow(G , 2.0) + pow(R , 2.0))

, where:

The bands are:

- G is the Green band
- R is the Red band

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

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