Vegetation types and structure adapted from Stellmes, M., Frantz, D., Finckh, M., Revermann, R. 2013a: Okavango Basin - Earth Observation. Biodiversity and Ecology, 5, 23-27. and Hansen tree cover and EVI data Tree cover and clearing from Hansen, M. C., P. V. Potapov, R. Moore, M. Hancher, S. A. Turubanova, A. Tyukavina, D. Thau, S. V. Stehman, S. J. Goetz, T. R. Loveland, A. Kommareddy, A. Egorov, L. Chini, C. O. Justice, and J. R. G. Townshend. 2013. “High-Resolution Global Maps of 21st-Century Forest Cover Change.” Science 342 (15 November): 850–53. Average Enhanced Vegetation Index (EVI) between 2000 and 2012. EVI is a measure of the average amount of green cover or plant canopy cover. (From Africa Soil Information Service.