Broadly interested in using remote sensing and spatial analysis to study environmental systems, in particular focussing on vegetation and time series analysis of vegetation change in different systems. Within this broad topic is included the response of animals to their environment (specifically the impact of vegetation change) to driving their movements. As a separate component to the focus on remote sensing for the study of environmental systems, is investigating means to improve the quality of environmental remote sensing products produced for use by stakeholders in southern Africa. Specific areas that together with students we are looking into include topics such as:
Animal movement and spatial distribution studies in relation to environmental parameters. This research area will encompass different topics either studying wildlife, livestock or their interaction with one another.
Study of woody structure of the dry woodlands of Namibia using remote sensing technology. The two principal areas that will be focused on include: Topics using multi-angular imagery to study changes in woody cover structure. This will be at regional scale using medium-low resolution imagery, would enable the study of longer term changes to woodland structure. The second aspect to be investigated is the use of high resolution imagery (UAV) with its potential 3D by-products to examine at small scale not only deforestration but selective harvesting. Is it possible through the use of the UAV 3D products to track selective harvesting within the dry woodlands. This combination of study to not only consider the change in structure, but the identification of species selection for selective harvesting.
High performance computing for aerial image processing within the Skeleton Coast for auto-detection and mapping of wildlife, and characteristic/diagnostic plant species.
Knox, N.M., Strohbach, B.J., De Cauwer, V. (2018) Potential use of 3D-derived products generated from unmanned aerial vehicle (UAV) imagery for monitoring forest degradation and woodland structure changes in the Namibian dry woodlands. Biodiversity & Ecology, 6:378-379. DOI: 10.7809/b-e.00349
Nichola M. Knox, Andrew K. Skidmore, Harald M.A. van der Werff, Thomas A. Groen, Willem F. de Boer, Herbert H.T. Prins, Edward Kohi, Mike Peel. (2013) Differentiation of plant age in grasses using remote sensing. International Journal of Applied Earth Observation and Geoinformation, 24:54-62.
Nichola M. Knox, Andrew K. Skidmore, Herbert H.T. Prins, Willem F. de Boer, Ignas M.A. Heitkönig, Frank van Langevelde. (2012) Remote sensing of forage nutrients: combining ecological and spectral absorption feature data. ISPRS Journal of Photogrammetry and Remote Sensing, 72: 27-35.
Nichola M. Knox, Andrew K. Skidmore, Gregory P. Asner, Herbert H.T. Prins, Harald M.A. van der Werff, Willem F. de Boer, Herbert H.T. Prins, Edward Kohi, Cornelis van der Waal, Henjo J. de Knegt, Robert Slotow, Rina C. Grant (2011). Mapping dry season savanna forage quality, using the hyperspectral Carnegie Airborne Observatory sensor. Remote Sensing of Environment, 115: 1478-1488.
De Cauwer,V., Knox, N.M., Kobue-Lekalake, R., Lepetu, J.P., Matenanga, O., Naidoo, S., Nott, A., Parduhn, D., Sichone, P., Tshwenyane, S., Yeboah, E. and Revermann, R. (2018). Woodland resources and management in southern Africa. Biodiversity & Ecology, 6:296-308. DOI: 10.7809/b-e.00337
B.N. Holben, J. Kim, I. Sano, S. Mukai, T.F. Eck, D.M. Giles, J.S. Schafer, A. Sinyuk, I. Slutsker, A. Smirnov, M. Sorokin, B.E. Anderson, H. Che, M. Choi, J.H. Crawford, R.A. Ferrare, M.J. Garay, U. Jeong, M. Kim, W. Kim, N. Knox, Z. Li, H.S. Lim, Y. Liu, H. Maring, M. Nakata, K.E. Pickering, S. Piketh, J. Redemann, J.S. Reid, S. Salinas, S. Seo, F. Tan, S.N. Tripathi, O.B. Toon, Q. Xiao (2018). An overview of mesoscale aerosol processes, comparisons, and validation studies from DRAGON networks. Atmospheric Chemistry and Physics, 18: 655-671. doi.org/10.5194/acp-18-655-2018