Sentinel-2 Brightness Index derived with ESA's SNAP Sentinel-2Toolbox

This index results from the following equation: Brightness Index = sqrt(((Red * Red)/ (Green* Green))/2) using Sentinel-2 Band 4 (Red) and Band 3 (Green). The index is sensitive to the brightness of soils. High soil brightness is linked with soil humidity and the presence of salts in the soil. (Escadafal, R. et al., Remote Sensing of Environment, p.37(1989)) The Brightness Index is called S2_BI in the Food Security TEP.