Surface of Titan : model and VIMS observations

In-situ observations made by Huygens combined with recent advances in the definition of methane properties enable to model the radiative transfer and to interpret observations with a very good accuracy. Although the atmosphere properties are not perfectly known at some wavelengths, wa can study the surface signature. In this presentation we will describe how we retrieve the surface albedo of Titan, showing where are the main uncertainties, and we will show how we model the surface signal to give an interpretation of the observations.