The MCARI1 operator algorithm computes the Modified Chlorophyll Absorption in Reflectance Index 1 from a given product.

The MCARI1 results from the following equation:

MCARI1 = 1.2 * (2.5 * (N - R) - 1.3 * (N - G))

, where:

The bands are:

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

Also the processor computes an additional flags band called 'mcari1_flags' with the following bit coding:

Bit Position	Description
Bit 0	The computed value for MCARI1 is NAN or is Infinite
Bit 1	The computed value for MCARI1 is less than -1 (minus one)
Bit 2	The computed value for MCARI1 is greater than 1 (one)