HRV-XS of SPOT imagery and MNT (Modè le Numè rique de Terrain) are used to compare, in dè sert areas, gè ological mapping from the visual interpretation of à stereoscopic pair ofHRV scenes and the combined classifications using the texture of HRV images and MNT. This comparison enables us to evaluate belter information from HRV imagery and to choose how to process information depending on the kind of ground studied and the means utilized. Combined classifications may be useful, however they do not have to be systematically undertaken, they may only support visual analysis which is a priority.