The FCVI operator algorithm computes the Fluorescence Correction Vegetation Index from a given product.

The FCVI results from the following equation:

FCVI = N - ((R + G + B) / 3.0)

, where:

The bands are:

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

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

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