Implementation of the Bidirectional Reflectance Function for Modeling the Spectra Derived from Hyperspectral Images

Hapke’s bidirectional reflectance function based on the theory of radiative transfer has been implemented for modeling the spectra derived from Chandrayaan-1 hyperspectral images. The parameter study was done to study the behavior and influence of each parameter like grain size, porosity, iron fraction which represents the degree of space weathering and phase function was critically assessed. The model was then tested against the four standard lunar mixtures which constitutes of major lunar minerals from RELAB, and it was observed that the artificially created model spectra were successful in reproducing the overall trend in the resultant spectra. Finally, the nine representative spectra derived from hyperspectral image of the Chandrayaan-1 HySI sensor covering part of Mare Vaporum were modeled. The mass fraction of the surface minerals along with the associated Hapke parameter was predicted.