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**Topic roadmap for vegetation indices.** - **What they are** — synthetic band-math layers (not measurements). - **Why they work** — healthy vegetation's low red / high NIR reflectance makes ratios diagnostic. - **What they correlate with** — **leaf area index (LAI)**, **% green cover**, **chlorophyll content**, **green biomass**. - **Which ones to know** — Simple Ratio (first), NDVI (standard), EVI (improved for dense canopies).

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