The TriVI operator algorithm computes the Triangular Vegetation Index from a given product.

The TriVI results from the following equation:

TriVI = 0.5 * (120 * (N - G) - 200 * (R - G))

, where:

The bands are:

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

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

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