Each type of material, soil, vegetation, water, etc. will reflect the incident radiation in a different way, which will allow us to distinguish it from the others if we measure the reflected radiation, giving us different values as a result.
Values close to 1: the more intense the green, the more vigorous the vegetation and canopy. To interpret it correctly, we must take into account what type of crop it is, extensive or intensive, if there is bare soil, the density at which it was planted, and the phenological stage in which it is found.
Values close to 0: these areas correspond to areas with very little vegetation, early stages of cultivation, bare soil, or non-productive areas.
Negative values: it is usually associated with areas of water, snow, or clouds…
