The GLI operator algorithm computes the Green Leaf Index from a given product.

The GLI results from the following equation:

GLI = (2.0 * G - R - B) / (2.0 * G + R + B)

, where:

The bands are:

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

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

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