The Normalized Difference Vegetation Index (NDVI) is a widely used remote sensing measurement that assesses the health and density of vegetation. It is based on the differential between visible and near-infrared light reflected by vegetation, leveraging the distinctive reflectance characteristics of healthy versus stressed plants.
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The normalized contrast of red and near-infrared reflectances. Large positive values indicate a vegetation-like spectrum, but soil, atmosphere, shadows and canopy saturation affect its interpretation.