The DSWI4 operator algorithm computes the Disease-Water Stress Index 4 from a given product.

The DSWI4 results from the following equation:

DSWI4 = G / R

, where:

The bands are:

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

Also the processor computes an additional flags band called 'dswi4_flags' with the following bit coding:

Bit Position	Description
Bit 0	The computed value for DSWI4 is NAN or is Infinite
Bit 1	The computed value for DSWI4 is less than -1 (minus one)
Bit 2	The computed value for DSWI4 is greater than 1 (one)