2.关键术语 2.1.1.17 Brightness Temperature (Tp) Brightness temperature(Tp)is a directional temperature obtained by equating the measured radiance with the integral over wavelength of the Planck's law times the sensor response.It is the temperature of a blackbody that would have the same radiance as the radiance actually observed with the sensor (Norman and Becker 1995),namely, [ 人2 To=B-I (2.16) where B represents the inverse function of Planck's law,A is the wavelength,A and A2 are the lower and upper wavelengths of sensitivity of the sensor in channel i,and Ra is the measured radiance at wavelength A,fi()is the spectral response function of the sensor in channel i