It is not always suitable to use Planck’s law or Stefan-Boltzmann’s law to describe the relation between brightness temperature and radiance for a wide band sensor.But given a Planck’s lawweighted and band averaged emis-sivity and an empirical fit equation between brightness temperature and radiance

it is still very feasible to retrieve compo-nent temperatures from mulit-angle data.In this paper

different equations to fit brightenss temperature and radiance for AMTIS（Airborne Multi-angle TIR/NIR Imaging System）are analyzed:the first approach is to use the stefan-Boltzmann’s law

and a compact equation including a T 4 term is found to be very effective;the second approach is to fit an appropriate wavelength using planck’s law The componnet temperature retrievel errors due to the band average of emissivity is also analyzed.