NDVI imaging – see the unseen 🛰️🌾
🍃Plants reflect more green light compared to red and blue light (due to their chlorophyll pigmentation).
☀️ Visible light is absorbed and converted into energy by the plant, while NIR light is not absorbed but reflected back.
🍂 This feature could be used as a tool to differentiate:
-> healthy plants, that reflect a lot of NIR and not much visible light,
-> unhealthy plants reflect less NIR and more visible light.
🛰️ NDVI (Normalized Difference Vegetation Index) measures the chlorophyll absorption in the red spectrum relative to the scattering by cellular structure in NIR.
🚜 Farming practices can benefit from NDVI measures that enable the estimation of crop yield in large tracts of land using satellite imaging.
🩺 Research has proved that NDVI could quickly detect abiotic stresses and pathogen infestation, even if there are no clear, visual signs of stress.
📷 Image: example of a typical plant reflectance curve (top), RGB and NVID imaging of a series of leaves progressively more withered from left to right (bottom) [credits: PhysicsOpenLab].
