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**Lecture objectives.** Three things to be able to explain by the end of the deck: 1. **Phenological cycle** — how a crop or natural vegetation community changes through the year. 2. **What a vegetation index is** and why it works (low red + high NIR signature). 3. **The three main VIs** — VI/SR, NDVI, EVI — their formulas, ranges, and where each is used.

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