The GM2 operator algorithm computes the Gitelson and Merzlyak Index 2 from a given product.

The GM2 results from the following equation:

GM2 = RE2 / RE1

, where:

The bands are:

- RE1 is the Red Edge 1 band
- RE2 is the Red Edge 2 band
- R is the Red band

Also the processor computes an additional flags band called 'gm2_flags' with the following bit coding:

Bit Position	Description
Bit 0	The computed value for GM2 is NAN or is Infinite
Bit 1	The computed value for GM2 is less than -1 (minus one)
Bit 2	The computed value for GM2 is greater than 1 (one)