NMDI_VEG identifies drought stress in vegetation canopies by combining spectral bands that respond to water content and chlorophyll status. It helps monitor plant water stress and early signs of drought impact. Higher NMDI_VEG values indicate healthier, well-hydrated vegetation, while lower values signal water stress or drought conditions.

Sentinel = (B08 - (B11 - B12)) / (B08 + (B11 - B12))
Landsat 8-9 = (nir08 - (swir16 - swir22)) / (nir08 + (swir16 - swir22))