The VIG operator algorithm computes the Vegetation Index Green from a given product.

The VIG results from the following equation:

VIG = (G - R) / (G + R)

, where:

The bands are:

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

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

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