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**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.

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