PE&RS July 2019 - page 511

Figure 1. Southern African savanna ecosystems defined by Olson et al. (2001). Nonsavanna (white) ecoregions are masked
out. The black crosses are validation sitesbased on Google Earth data. The zoomin panel shows the extents of two IKONOS
images within the red box.
Figure 2. a) FAO Land Use characteristics including indications of livestock density (LD) (FAO/ISRIC 2003); and b) Mean annual
precipitation (1950–2000) in the Africa savanna from WorldClim—Global Climate Data (Hijmans et al. 2005).
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