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Browsing by Subject "Hyperspectral"

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Abundance estimation of spectrally similar minerals

Author: Debba, Pravesh Date: Jul 2009 This paper evaluates a spectral unmixing method for estimating the partial abundance of spectrally similar minerals in complex mixtures. The method requires formulation of a linear function of individual spectra of individual minerals. The ... Read more
Comparison between sensors with different spectral resolutions, relative to the sumbandila satellite, for assessing site quality differences, in eucalyptus grandis plantations

Author: Main, Russell S ; Cho, Moses A ; Van Aardt, J ; Majeke, B Date: Oct 2008 The majority of earth observation studies have for years made use of data from multispectral spaceborne sensors. More recently though, both airborne and spaceborne narrowband hyperspectral sensors have come to the fore and are able to provide ... Read more
Distinguishing cyanobacteria from algae in optically complex inland waters using a hyperspectral radiative transfer inversion algorithm

Author: Matthews, MW ; Bernard, Stewart ; Evers-King, H ; Robertson Lain, L Date: Oct 2020 A hyperspectral inversion algorithm was used to distinguish between cyanobacteria and algal blooms in optically complex inland waters. A framework for the algorithm is presented that incorporates a bio-optical model, a solution for the radiative ... Read more
Evaluation of discrimination measures to characterize spectrally similar leaves of African Savannah trees

Author: Dudeni, N ; Debba, Pravesh Date: Aug 2009 Deterministic and stochastic measures of spectral similarity are essential for determining both the geometric characteristics of spectra and variability, respectively. Deterministic measures such as Spectral Angle Mapper (SAM) are useful in ... Read more
Field sampling scheme optimization using simulated annealing

Author: Debba, Pravesh Date: Oct 2010 This chapter discusses the methodology of using simulated annealing in deriving optimal sampling schemes to target a specific mineral, for example, alunite. Read more
Geochemical sampling scheme optimization on mine wastes based on hyperspectral data

Author: Zhao, T ; Debba, Pravesh ; Stein, A Date: Jul 2008 Spatial sampling optimization is an important issue for both geo-chemists and geo-statisticians. Many spatial sampling optimization methods have been previously developed. In this paper, we present a spatial simulated annealing method is ... Read more
Integrating environmental and in situ hyperspectral remote sensing variables for grass nitrogen estimation in savannah ecosystems

Author: Ramoelo, Abel ; Cho, Moses A ; Mathieu, Renaud SA ; Skidmore, AK ; Schlerf, M ; Heitkonig, IMA ; Prins, HHT Date: Apr 2011 Information about the distribution of grass nitrogen (N) concentration is crucial in understanding rangeland vitality and facilitates effective management of wildlife and livestock. A challenge in estimating grass N concentration using remote ... Read more
Optimal individual supervised hyperspectral band selection distinguishing savannah trees at leaf level

Author: Debba, Pravesh ; Cho, Moses A ; Mathieu, Renaud SA Date: Aug 2009 This paper uses simulated annealing and focus on the spectral angle mapper (SAM), to demonstrate how the separability of two mean spectra from different species can be increased by choosing the bands that maximize the metric. It is known that ... Read more
Optimal sampling schemes applied in geology

Author: Debba, Pravesh Date: May 2010 The presentation was an the University of Pretoria to geology students. It focused on ways to design optimal sampling schemes to target specific minerals. Read more
Optimum sampling scheme for characterization of mine tailings

Author: Debba, Pravesh ; Carranza, EJM ; Stein, A ; Van der Meer, FD Date: Jul 2009 The paper describes a novice method for sampling geochemicals to characterize mine tailings. The author’s model the spatial relationships between a multi-element signature and, as covariates, abundance estimates of secondary iron-bearing ... Read more
Potential to monitor plant stress using remote sensing tools

Author: Ramoelo, Abel ; Dzikiti, Sebinasi ; Van Deventer, Heidi ; Maherry, A ; Cho, Moses A ; Gush, Mark B Date: Jan 2014 The growing energy crisis has necessitated the expansion of thermal power stations to meet South Africa's electricity needs. Possessing vast amounts of coal deposits, the Waterberg region of the Limpopo Province is set to undergo rapid ... 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 mapping of savanna tree species at canopy level, with focus on tall trees, using an integrated CAO Hyperspectral & LiDAR sensor approach

Author: Naidoo, Laven ; Mathieu, Renaud SA ; Cho, Moses A ; Asner, G ; Eckardt, F Date: Mar 2010 The detection and mapping of tree/plant species in the savanna ecosystem can provide numerous benefits for the managerial authorities. This includes the accurate mapping of the spatial distribution of economically viable trees which are a key ... Read more
Spherical stochastic neighbor embedding of hyperspectral data

Author: Lunga, D ; Ersoy, O Date: Jul 2012 In hyperspectral imagery, low-dimensional representations are sought in order to explain well the nonlinear characteristics that are hidden in high-dimensional spectral channels. While many algorithms have been proposed for dimension reduction ... Read more
Tree cover, tree height and bare soil cover differences along a land use degradation gradient in semi-arid savannas, South Africa

Author: Mathieu, Renaud SA ; Wessels, Konrad J ; Asner, G ; Knapp, D ; van Aardt, J ; Main, Russell S ; Cho, Moses A ; Erasmus, B ; Smit, I Date: Jul 2009 High resolution airborne hyperspectral and discrete return LiDAR data were used to assess bare soil and tree cover differences along a land use transect consisting of state-owned, privately-owned conservation areas, and communal areas in South ... Read more

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