1. Department of Geography, University of South Africa, Florida, 1710, South Africa
2. Department of Geography, Rhodes University, Drosty Road, Grahamstown, 6139, South Africa
3. Department of Geography and Environmental Science, University of Fort Hare, Alice, 5700, South Africa
4. Department of Geography, Geoinformatics and Meteorology, University of Pretoria, Pretoria, South Africa
5. Department of Geography, University of the Free State, 205 Nelson Mandela Drive, Bloemfontein, 9301, South Africa