1. a Remote Sensing Research Unit, Meraka Institute, Council for Scientific and Industrial Research (CSIR) , Pretoria , South Africa
2. b Information & Communications Technology for Earth Observation, Meraka Institute, Council for Scientific and Industrial Research (CSIR) , Pretoria , South Africa
3. c High Performance Computing Research Group, Meraka Institute, Council for Scientific and Industrial Research (CSIR) , Pretoria , South Africa
4. d Signal Processing Research Group, Defence, Peace, Safety and Security, Council for Scientific and Industrial Research (CSIR) , Pretoria , South Africa