Task: Class Definition Understanding (ontology: Earth_Environment/OBOE)

Which of the following definitions best describes 'Luminance'?

A. The developmental stage of life of a given organism.
B. the concept is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. The SI unit for the concept is candela per square metre (cd/m2).
C. the concept and spectral the concept are radiometric measures that describe the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle in a specified direction. They are used to characterize both emission from diffuse sources and reflection from diffuse surfaces. The SI unit of the concept is watts per steradian per square metre (W·sr−1·m−2).
D. the concept amount of substance of solute B in a solution divided by the mass of the solvent: Often favored because measurements of mass are more precise than measurements of volume.

Answer: the concept is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. The SI unit for the concept is candela per square metre (cd/m2).