Hannelie is a remote sensing scientist with expertise in environmental remote sensing, hyperspectral radiative transfer modelling and the application of remote sensing solutions to environmental management problems. She has been involved in environmental remote sensing applications and settings ranging from coral reef, coastal and estuarine habitats to inland water bodies, rangelands and agricultural land. Hannelie’s current work focuses on the application of optical models to multispectral satellite data to discriminate marine habitat and benthic substratum type in optically shallow coral reef and coastal waters and the assessment of water quality in marine and fresh water environments.