= Normalized Difference Red Edge Index
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The Normalized Difference Red Edge Index (NDREI) is a remote sensing index used to assess vegetation health and monitor plant stress. It leverages the reflectance properties of plants in the red edge region of the electromagnetic spectrum, which is typically found between the red and near-infrared (NIR) wavelengths. The red edge is particularly sensitive to changes in chlorophyll content and leaf structure, making it an effective indicator for analyzing vegetation conditions.
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