Albedo

Percentage of reflected sun light in relation to various surface conditions of the Earth.

The albedo of an object is the extent to which it reflects light, defined as the ratio of reflected to incident electromagnetic radiation. It is a unitless measure indicative of a surface's or body's diffuse reflectivity. The word is derived from albus, a Latin word for "white".

Other websites

• Albedo - Encyclopedia of Earth
• NASA MODIS Terra BRDF/albedo product site
• NASA MODIS BRDF/albedo product site
• A discussion of Lunar albedos