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| Principles of Night-vision Imaging |
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Figure 4. Foliage reflectivity: foliage reflects available night-sky IR (figure 3) far more efficiently than visible light. Seen through NVIS, foliage clearly defines nighttime terrain.
The combination of NVIS IR response, night sky irradiance, and foliage reflectivity is very important for low-flying aircraft, especially helicopters, because it gives the pilot a very sharp image of nighttime terrain.
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