1. Centre for African Ecology; Restoration and Conservation Biology Research Group; School of Animal, Plant & Environmental Sciences; University of the Witwatersrand; WITS Johannesburg 2050 South Africa
2. Centre for African Ecology; School of Animal, Plant & Environmental Sciences; University of the Witwatersrand; WITS Johannesburg 2050 South Africa
3. Restoration and Conservation Biology Research Group; School of Animal, Plant & Environmental Sciences; University of the Witwatersrand; WITS Johannesburg 2050 South Africa
4. Chester F. Carlson Center for Imaging Science; Rochester Institute of Technology; 54 Lomb Memorial Drive Rochester NY 14623 USA
5. Remote Sensing Research Unit; Council for Scientific and Industrial Research (CSIR)-Meraka Institute; P.O. Box 395 Pretoria 0001 South Africa
6. Department of Global Ecology; Carnegie Institution for Science; 260 Panama Street Stanford CA 94305 USA