AFAI:
Alternate Floating Algae Index (in reflectance units) to detect ocean surface features such as Sargassum, green macroalgae, and cyanobacteria. AFAI is a 1km product and nearly identical to FAI, except that the band combination is different. It is more sensitive than FAI to detect subtle ocean surface features, but it saturates under sun glint, clouds, or thick aerosols (i.e., less coverage than FAI). See FAI description for more algorithm details.
