surface_bidirectional_reflectance
https://w3id.org/hacid/data/cs/variables/cf/surface_bidirectional_reflectance <https://w3id.org/hacid/onto/data/Variable>
The surface called "surface" means the lower boundary of the atmosphere. "Bidirectional_reflectance" depends on the angles of incident and measured radiation. Reflectance is the ratio of the energy of the reflected to the incident radiation. A coordinate variable of radiation_wavelength or radiation_frequency can be used to specify the wavelength or frequency, respectively, of the radiation.
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surface_bidirectional_reflectance