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radiance

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  1. [photogrammetry] Radiation that is reflected from the surface of a feature, bounced into the optical path from surrounding areas, and reflected from clouds above the area of a pixel. It is a measurement of the flux density of radiant energy per unit solid angle and per unit projected area of radiating surface, measured in watts per steradian per square meter (W·sr–1·m–2), as a function of wavelength.

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