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Measuring Vegetation (NDVI & EVI). NASA Earth Obs. . https://earthobservatory.nasa.gov/features/MeasuringVegetation/measuring_vege-tation_2.php (accessed Oct 21, 2020).
Measuring Vegetation (NDVI & EVI). NASA Earth Obs. . https://earthobservatory.nasa.gov/features/MeasuringVegetation/measuring_vege-tation_2.php (accessed Oct 21, 2020).