| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Land >
Albedo and reflectance >
Black and White Sky Albedo
  | Measurement Definition*: The directional albedo or directional-hemispherical reflectance (also called black-sky albedo) is the integration of the bi-directional reflectance over the viewing hemisphere. It assumes all energy is coming from a direct radiation from the sun and is computed for a specific time. The hemispherical albedo or bi-hemispherical reflectance (also called white-sky albedo) is the integration of the directional albedo over the illumination hemisphere. It assumes a complete diffuse illumination. |
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* Description adapted from WMO.
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