"SDN:P07::CFSN0218" . "" . "SDN:P07::CFSN0218" . . . "2013-06-27 14:07:56.0" . "true" . . "SDN:P07::CFSN0218" . . "deprecated"@en . "2" . "surface_upwelling_spectral_radiance_in_air"@en . "2013-06-27 14:07:56.0" . . . . . "2" . . . "The surface called 'surface' means the lower boundary of the atmosphere. Upwelling radiation is radiation from below. It does not mean 'net upward'. 'spectral' means per unit wavelength or as a function of wavelength; spectral quantities are sometimes called 'monochromatic'. Radiation wavelength has standard name radiation_wavelength. Radiance is the radiative flux in a particular direction, per unit of solid angle. The direction towards which it is going must be specified, for instance with a coordinate of zenith_angle. If the radiation does not depend on direction, a standard name of isotropic radiance should be chosen instead."@en .