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  1. [physics] The proportion of incident radiant energy that is reflected by a surface. Reflectance varies according to the wavelengths of the incident radiant energy and the color and composition of the surface.
  2. [photogrammetry] In imagery, the ratio of light reflected from an object or that is captured by a target above the object. This ratio is wavelength-dependent, and the value's range is between 0 and 1 or can be expressed as a percentage.

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