02/09/2026
Sentinel-2 Bands Explained for Environmental Mapping
Sentinel-2, part of the European Space Agency's Copernicus program, carries a multi-spectral instrument that captures 13 distinct bands from 400 nm to 2,500 nm.
These bands are grouped into three spectral ranges-Visible
(VIS), Near-Infrared (NIR), and Short-Wave Infrared (SWIR)
โeach tailored to highlight specific environmental features.
By combining them, scientists can detect vegetation health, soil moisture, water quality, and mineral composition with high precision.
Visible Bands (B2, B3, B4, B5)
B2 (Blue, 490 nm), B3 (Green, 560 nm), and B4 (Red, 665 nm) form the classic RGB composite, revealing canopy structure and surface color. Band 5 (Red-Edge, 705 nm) sits between red and NIR and is highly sensitive to chlorophy!! content, enabling early detection of plant stress before visible symptoms appear.
Near-Infrared Bands (B8, B&A, B11, B12)
NIR bands (B8: 842 nm, B&A: 865 nm) strongly reflect healthy vegetation, providing the backbone for vegetation indices such as NDVI. B11 and B12 (SWIR, 1610 nm & 2190 nm) detect water absorption features, crucial for mapping soil moisture and distinguishing between plant and bare ground.
Short-Wave Infrared Bands (B6, B7, B9)
B6 (665 nm) and B7 (705 nm) are also red-edge bands, offering fine-scale vegetation discrimination. B9 (water vapour, 945 nm) is key for atmospheric correction, improving the accuracy of surface reflectance estimates.
Short-Wave Infrared Bands (B6, B7, B9)
B6 (665 nm) and B7 (705 nm) are also red-edge bands, offering fine-scale vegetation discrimination. B9 (water vapour, 945 nm) is key for atmospheric correction, improving the accuracy of surface reflectance estimates.
Applications in Environmental Monitoring
By leveraging these bands, researchers generate land-cover maps, monitor deforestation, assess crop yield, and detect algal blooms in water bodies. The high revisit frequency (5-10 days) allows near real-time monitoring of dynamic ecosystems, essential for timely management decisions and climate resilience strategies.
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