The BNDVI operator algorithm computes the Blue Normalized Difference Vegetation Index from a given product.

The BNDVI results from the following equation:

BNDVI = (N - B) / (N + B)

, where:

The bands are:

- B is the Blue band
- N is the NIR band

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

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