EVI corrects NDVI’s main weaknesses — atmospheric aerosol scattering (via the blue band) and soil-background brightness (via the L term).

EVI = [(NIR − Red) / (NIR + C1·Red − C2·Blue + L)] × (1 + L)

With C1 = 6.0, C2 = 7.5, L = 1.0 (MODIS standard).

• Improved sensitivity in high-biomass regions where NDVI saturates.
• Requires a blue band — not every sensor has one, but MODIS, Landsat 8/9, and Sentinel-2 do.