The DBSI operator algorithm computes the Dry Bareness Index from a given product.

The DBSI results from the following equation:

DBSI = ((S1 - G) / (S1 + G)) - ((N - R) / (N + R))

, where:

The bands are:

- G is the Green band
- R is the Red band
- N is the NIR band
- S1 is the SWIR 1 band

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

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