The NRFIr operator algorithm computes the Normalized Rapeseed Flowering Index Red from a given product.

The NRFIr results from the following equation:

NRFIr = (R - S2) / (R + S2)

, where:

The bands are:

- R is the Red band
- S2 is the SWIR 2 band

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

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