The NDVIT operator algorithm computes the Normalized Difference Vegetation Index Thermal from a given product.

The NDVIT results from the following equation:

NDVIT = (N - (R * T / 10000.0)) / (N + (R * T / 10000.0))

, where:

The bands are:

- R is the Red band
- N is the NIR band
- T is the Thermal band

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

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