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If you’ve never seen a NDVI (Normalized Difference Vegetation Index) map, they look pretty much like a topography map, which shows a green color in areas denoting healthy vegetation and yellow to red colors in more difficult areas. For the science-oriented, according to the GISgeography website, NDVI quantifies vegetation by measuring the difference between near-infrared (vegetation that strongly reflects) and red light (vegetation that absorbs). Healthy vegetation (chlorophyll) reflects more near-infrared (NIR) and green light compared to other wavelengths. But it absorbs more red and blue light, which is why our eyes see vegetation as the color green.