Savannahs are characterized by a co-existence of grasses and trees. Nowadays, these ecosystems are considerably affected by human impact, as they are used for various types of agriculture and support a major part of the population within the tropics. E.g., it is widely accepted that in many regions of Southern Africa, livestock farming with inadequate stocking rates has facilitated bush encroachment and strongly alters vegetation structure and composition in these environments. Keywords: Landsat ETM, SPOT VGT, Namibia, wood cover, PLS regression.