The steep increase of healthy green vegetation reflectance between red absorption and the high near-infrared scattering plateau, typically around 0.68–0.75 micrometres.
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The term "red edge" can refer to several concepts depending on the context, including: 1. **Biological Context**: In ecology and remote sensing, the "red edge" phenomenon refers to the sharp change in reflectance of plant leaves in the near-infrared spectrum. Specifically, it occurs between the red and near-infrared wavelengths (approximately 680 to 750 nanometers).