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Remote sensing of vegetation is based on the scientific principles of the interaction between electromagnetic radiation and plant canopies. This interaction is influenced by the physiological and structural characteristics of vegetation, which in turn determine how vegetation reflects, absorbs, and transmits solar radiation across different wavelengths. Remote sensing techniques allow for the monitoring, classification, and analysis of vegetation over large areas using satellite or airborne sensor data. The basis of remote sensing of vegetation lies in the unique spectral reflectance properties of plants, especially in the visible, near-infrared (NIR), and shortwave infrared (SWIR) regions of the electromagnetic spectrum. ### Spectral Reflectance Characteristics of Vegetation Vegetation reflects, absorbs, and transmits solar radiation differently at different wavelengths. The typical reflectance curve of healthy green vegetation can be divided into three major spectral regions: 1. Visible Region (400–700 nm): Chlorophyll pigments in plant leaves strongly absorb blue (\~450 nm) and red (\~670 nm) light for photosynthesis. Green light (\~550 nm) is reflected more, which is why vegetation appears green to the human eye. 2. Near-Infrared Region (700–1300 nm): This region is characterized by high reflectance due to the internal structure of the leaf mesophyll. Healthy vegetation reflects 40-60% of NIR radiation, making this region crucial for assessing plant health ______ _________ ____ ___ ________ ___ ___ ____ ______.
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