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Browsing by Subject "Hyperspectral remote sensing"

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Assessing degradation across a land-use gradient in the Kruger National Park area using advanced remote sensing modalities

Author: Van Aardt, JAN ; Mathieu, Renaud SA ; Cho, Moses A ; Wessels, Konrad J ; Erasmus, B ; Asner, GP ; Smit, IPJ Date: 2011 Land degradation is regarded as one of the most important environmental issues facing sub-Saharan Africa and is especially relevant in the former communal ‘homeland’ areas of South Africa. Although it has been a topic of intense research, ... Read more
Debba China presentation on optimal field sampling for exploration targets and geochemicals

Author: Debba, Pravesh Date: Oct 2008 A presentation was done at the Chinese Academy of Geological Science in October 2008 on optimal field sampling for both exploration targets and sampling for geochemicals in mine tailing areas Read more
Deriving optimal exploration target zones on mineral prospectivity maps

Author: Debba, Pravesh ; Carranza, EJM ; Stein, A ; Van der Meer, FD Date: Aug 2008 This paper describes a quantitative methodology for deriving optimal exploration target zones based on a probabilistic mineral prospectivity map. The methodology is demonstrated in the Rodalquilar mineral district in Spain. A subset of known ... Read more
Effect of canopy cover and canopy background variables on spectral proﬁles of savanna rangeland bush encroachment species based on selected Acacia species (mellifera, tortilis, karroo) and Dichrostachys cinerea at Mokopane, South Africa

Author: Munyati, C ; Economon, EB ; Malahlela, OE Date: Jul 2013 The proliferation of woody plant species on savanna rangelands (i.e. bush encroachment) degrades rangeland quality, thereby threatening the biodiversity conservation effort as well as pastoral farming. Hyperspectral remote sensing offers ... Read more
Evaluating variations of physiology-based hyperspectral features along a soil water gradient in Eucalyptus grandis plantation

Author: Cho, Moses A ; van Aardt, J ; Main, Russell S ; Majeke, B Date: Apr 2010 Remote sensing is viewed as a cost-effective alternative to intensive field surveys in assessing site factors that affect growth of Eucalyptus grandis over broad areas. The objective of this study was to assess the utility of hyperspectral ... Read more
Improving classification accuracy of spectrally similar tree species: a complex case study in the Kruger National Park

Author: Debba, Pravesh Date: Jul 2009 This presentation to the SASA Eastern Cape Chapter at Rhodes University studies the variability within a species class and the variability between the species classes of seven spectrally similar tree species and presents ways in which the ... Read more
Improving discrimination of savanna tree species through a multiple endmember spectral-angle-mapper (SAM) approach: canopy level analysis

Author: Cho, Moses A ; Debba, Pravesh ; Mathieu, Renaud SA ; Naidoo, Laven ; Van Aardt, J ; Asner, G Date: Nov 2010 Differences in within-species phenology and structure are controlled by genetic variation, as well as topography, edaphic properties, and climatic variables across the landscape and present important challenges to species differentiation with ... Read more
Integrating remote sensing and ancillary data for regional ecosystem assessment: eucalyptus grandis agro-system in kwazulu-Natal, South Africa

Author: Cho, Moses A ; Van Aardt, J ; Main, Russell S ; Majeke, B ; Mathieu, Renaud SA ; Norris-Rogers, M ; Du Plessis, M ; Ramoelo, Abel Date: Jul 2009 The study demonstrates that the integration of remote sensing and in situ data could be important in providing more accurate estimates of E. grandis state in KwaZulu Natal, South Africa compared to remote sensing models. Such modelling effort ... Read more
Methodology to unmix spectrally similar minerals using high order derivative spectra

Author: Debba, Pravesh Date: Jul 2009 This presentation presented to the SASA Eastern Cape Chapter at Rhodes University posses two questions: (a) how could estimates of abundances of spectrally similar iron-bearing oxide/hydroxide/sulfate minerals in complex mixtures be obtained ... Read more
Savanna grass nitrogen to phosphorus ratio estimation using field spectroscopy and the potential for estimation with imaging spectroscopy

Author: Ramoelo, Abel ; Skidmore, A ; Schlerf, M ; Heitkönig, I ; Mathieu, Renaud SA ; Cho, Moses A Date: Aug 2013 Determining the foliar N: P ratio provides a tool for understanding nutrient limitation on plant production and consequently for the feeding patterns of herbivores. In order to understand the nutrient limitation at landscape scale, remote ... Read more
Seasonal variation in canopy reflectance and its application to determine the water status and water use by citrus trees in the Western Cape, South Africa

Author: Dzikiti, Sebinasi ; Verreynne, SJ ; Stuckens, J ; Strever, A ; Verstraeten, WW ; Swennen, R ; Theron, KI ; Coppin, P Date: Aug 2011 This study describes the diurnal and seasonal dynamics of the canopy reflectance, water use and water status of Midknight Valencia citrus trees under semi-arid conditions. Hyperspectral canopy reflectance data was collected on 30 trees at ... Read more
Species discrimination of African savannah trees at leaf level using hyperspectral remote sensing

Author: Majeke, B ; Cho, Moses A ; Debba, Pravesh ; Mathieu, Renaud SA ; Ramoelo, Abel Date: Mar 2009 The management of the Kruger National Park, South Africa has expressed the need to find cost-effective and rapid means to assess species diversity in the park. Remote sensing is viewed as a cost-effective alternative to intensive field sampling. ... Read more
Spectral band discrimination for species observed from hyperspectral remote sensing

Author: Dudeni, N ; Debba, Pravesh ; Cho, Moses A ; Mathieu, Renaud SA Date: Aug 2009 In vegetation spectroscopy, compositional information of leaves contained at band level or across the electromagnetic spectrum (EMS) and parts thereof, plays a huge rule in the analysis of spectra and their relations to the reflectance patterns ... Read more
Using remote sensing images to design optimal field sampling schemes

Author: Debba, Pravesh Date: Aug 2008 At this presentation, the author discussed a statistical method for deriving optimal spatial sampling schemes. First I focus on ground verification of minerals derived from hyperspectral data. Spectral angle mapper (SAM) and spectral feature ... Read more

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Browsing by Subject "Hyperspectral remote sensing"

Browsing by Subject "Hyperspectral remote sensing"

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