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Browsing by Subject "Geoscience"

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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
Automated land cover change detection: the quest for meaningful high temporal time series extraction

Author: Salmon, BP ; Olivier, JC ; Kleynhans, W ; Wessels, Konrad J ; Van den Bergh, F Date: Jul 2010 An automated land cover change detection method is proposed that uses coarse resolution hyper-temporal satellite time series data. The study compared two different unsupervised clustering approaches that operate on the short term Fourier ... Read more
CSIR-NLC mobile LIDAR for atmosphere remote sensing

Author: Sivakumar, V ; Tesfaye, M ; Botai, J ; Moema, D ; Sharma, Ameeth ; Bollig, C ; Hannes Rautenbach, CJ Date: Jul 2009 A mobile LIDAR (LIght Detection And Ranging) system is being developed and employed for atmosphere remote sensing at the Council for Scientific and Industrial Research (CSIR) National Laser Centre (NLC), Pretoria (25.45 S;28.16 E), South ... Read more
CSIR-NLC mobile LIDAR: first scientific results

Author: Sivakumar, V ; Tesfaye, M ; Moema, D ; Sharma, Ameeth ; Bollig, C Date: Jul 2009 In this paper, researchers present the obtained first scientific results from CSIR-NLC mobile LIDAR (LIght Detection And Ranging) and its validation/comparison with other ground and space-borne measurements. The LIDAR results are compared ... Read more
Effects of viewing- and illumination geometry on settlement type classification of quickbird images

Author: Van den Bergh, F Date: Jul 2011 Image texture features extracted from high-resolution remotely sensed images over urban areas have shown promise in their ability to distinguish different settlement classes. Without any explicit mechanism to counter the effects of variable ... Read more
Extracting structural land cover components using small-footprint waveform LDAR data

Author: McGlinchy, J ; Van Aardt, J ; Rhody, H ; Kerekes, J ; Ientiluci, E ; Asner, GP ; Knapp, D ; Mathieu, Renaud SA ; Kennedy-Bowdoin, T ; Erasmus, BFN ; Wessels, Konrad J ; Smit, IPJ ; Wu, J ; Sarrazin, D Date: Jul 2010 Previous work has shown the ability of waveform LiDAR sensors to accurately describe various land cover types and biomass estimates made in the field. What is lacking, however, is a way to describe the different structural components that are ... 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
National geoscience programme. The evolution of earth resource systems

Author: SACUGS Date: Jun 1981 This report contains an outline of the research proposed for the National Geoscience Programme which has as its main theme the study of the processes of ore formation in the earth's crust. Research will focus on the development of conceptual ... Read more
New airborne geophysical data from the Waterberg coalfield. South Africa's major future energy source

Author: Fourie, CJS ; Du Plessis, SJ ; Henry, G Date: Nov 2008 The Waterberg Coalfield in the Limpopo Province of South Africa contains vast resources of coal that will ensure the country's energy security well into the future. The coalfield is situated in the Karoo-age Ellisras Basin and at present hosts ... Read more
On using discrete return LIDAR distributions as a proxy for waveform LIDAR signals when modeling vegetation structure

Author: Van Aardt, JAN ; Wu, J ; McGlinchy, J ; Wessels, Konrad J ; Mathieu, Renaud SA ; Kennedy Bowdoin, T ; Knapp, DE ; Asner, GP Date: Jul 2012 The goals of the study were to (i) determine if there is a direct relationship between waveform LiDAR intensity-by-height and discrete return frequency-by-height (do the distributions match?) and (ii) assess the impact of scale (does this ... 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 fire detection based on Kalman-driven change detection

Author: Van Den Bergh, F ; Udahemuka, G ; Van Wyk, BJ Date: Jul 2009 A new active fire event detection algorithm for data collected with the Spinning Enhanced Visible and Infrared Imager (SEVIRI) sensor, based on the extended Kalman filter, is introduced. Instead of using the observed temperatures of the spatial ... Read more
The reinvigorated South African GRSS Chapter

Author: Schwegmann, Colin P Date: Sep 2017 Looking ahead, the South African GRSS Chapter is investigating the possibility of organizing a meeting with local GRSS members, universities, and other remote-sensing organizations with the purpose of engaging undergraduate and early postgraduate ... Read more
Retrieval of atmospheric boundary layer height by CSIR NLC mobile LIDAR, Pretoria (25.5° S; 28.2° E), South Africa

Author: Sivakumar, V ; Sharma, Ameeth ; Bollig, C Date: Jul 2011 In this paper, the authors present the preliminary methods for detection of the boundary layer based on backscattered signals from a mobile LIDAR (LIght Detection And Ranging) developed at Council for Scientific and Industrial Research (CSIR) ... Read more
Selecting suitable coherent processing time window lengths for ground-based ISAR imaging of cooperative sea vessels

Author: Abdul Gaffar, MY ; Nel, Willem AJ ; Inggs, MR Date: Sep 2009 Inverse synthetic aperture radar (ISAR) imaging of sea vessels is a challenging task because their 3-D rotational motion over the coherent processing interval (CPI) often leads to blurred images. The selection of the duration of the CPI, also ... Read more
Self-organising sensor web using cell-fate optimisation

Author: Van Zyl, TL ; Ehlers, EM Date: Jul 2009 The Sensor Web as an open complex adaptive system exhibits many characteristics that are common to self organising systems. One of the characteristics of the Sensor Web is that of self-adaptivity in a changing environment. The changing ... Read more
South African initiative for pre-flight radiometric calibration of satellite imagers

Author: Griffith, D ; Lysko, M ; Bezuidenhout, D Date: Jul 2009 Internationally, the remote observation of Earth is rapidly maturing alongside the need for higher accuracy in radiance measurements. Accuracy of, and confidence in Earth radiance measurements is vital for applications such as climate change ... Read more
Spectral variability within species and its effects on savanna tree species discrimination

Author: Cho, Moses A ; Debba, Pravesh ; Mathieu, Renaud SA ; Van Aardt, J ; Asner, G ; Naidoo, Laven ; Main, Russell S Date: Jul 2009 Differences in within-species phenology and structure driven by factors including topography, edaphic properties, and climatic variables present important challenges for species differentiation with remote sensing in the Kruger National Park, ... 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
Using SensorML to describe scientific workflows in distributed web service environments

Author: Van Zyl, TL ; Vahed, Anwar ; Mcferren, GA ; Shabangu, P ; Cwele, B Date: Jul 2009 Scientific Workflows provides a technology that facilitates researchers by allowing them to capture in a machine processable manner the method relating to some research. This increases both provenance and repeatability of the research and ... Read more

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