Reflectance (or more specifically hemispherical reflectance) is a property of the material being observed. If all of the light leaving the target is intercepted for the measurement of reflectance, the result is called "hemispherical reflectance." Reflectance is the ratio of the amount of light leaving a target to the amount of light striking the target. Radiance most often has units of watt/(steradian/square meter). An atmosphere will also absorb light, which will decrease the observed radiance. When looking through an atmosphere, some light scattered by the atmosphere will be seen by the instrument and included in the observed radiance of the target. Basically, you can think of radiance as how much light the instrument "sees" from the object being observed. Radiance is the variable directly measured by remote sensing instruments. What is the difference between radiance and reflectance?
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