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Browsing by Author "Stein, A"

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Comparison study of design rainfall mapping using ordinary kriging and kriging with external drift

Author: Khuluse, S ; Stein, A ; Debba, Pravesh Date: Mar 2011 Early development of Extreme Value Theory (EVT) was motivated by a need to quantify the probability of unusually large (or small) events in hydrology and climatology. The current challenge in modelling extremes is how to adequately account ... 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
Ensemble classification for identifying neighbourhood sources of fugitive dust and associations with observed PM10

Author: Khuluse-Makhanya, Sibusisiwe A ; Stein, A ; Breytenbach, Andre ; Gxumisa, Athi A ; Dudeni-Tlhone, Nontembeko ; Debba, Pravesh Date: Oct 2017 In urban areas the deterioration of air quality as a result of fugitive dust receives less attention than the more prominent traffic and industrial emissions. We assessed whether fugitive dust emission sources in the neighbourhood of an air ... Read more
Field Sampling from a Segmented Image

Author: Debba, Pravesh ; Stein, A ; Van der Meer, FD ; Carranza, EJM ; Lucieer, A Date: Jun 2008 This paper presents a statistical method for deriving the optimal prospective field sampling scheme on a remote sensing image to represent different categories in the field. The iterated conditional modes algorithm (ICM) is used for segmentation ... 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
Mapping the N-Year design rainfall - A case study for the Western Cape

Author: Khuluse, S ; Dowdeswell, M ; Debba, Pravesh ; Stein, A Date: Nov 2010 Flooding is often associated with heavy rainfall. Hence quantifying the probability associated with heavy rainfall events is useful in hydrology for design flood estimation and mapping Rainfall varies over time and space, therefore it is ... Read more
Methodology for deriving optimal exploration target zones

Author: Debba, Pravesh ; Carranza, E ; Stein, A ; Van der Meer, F Date: Mar 2010 This research describes a quantitive methodology for deriving optimal exploration target zones based on a probalistic mineral prospectivity map.The Rodalquilar mineral district is located in the Sierra del Cabo de Gata volcanic field, in the ... Read more
Optimal exploration target zones

Author: Debba, Pravesh ; Carranza, EJM ; Stein, A ; Van der Meer, FD Date: Sep 2008 This research describes a quantitative methodology for deriving optimal exploration target zones based on a probabilistic mineral prospectivity map. In order to arrive at out objective, we provide a plausible answer to the following question: ... Read more c b
Optimal exploration target zones

Author: Debba, Pravesh ; Carranza, EJM ; Stein, A ; Van der Meer, FD Date: Sep 2008 This research describes a quantitative methodology for deriving optimal exploration target zones based on a probabilistic mineral prospectivity map. In order to arrive at out objective, we provide a plausible answer to the following question: ... Read more
Optimal spatial sampling scheme to characterize mine tailings

Author: Debba, Pravesh ; Carranza, EJM ; Stein, A ; Van der Meer, FD Date: Aug 2009 This research discusses a novice method for sampling geochemicals to characterize mine tailings. Researchers model the spatial relationships between a multi-element signature and abundance estimates of secondary iron-bearing minerals in mine ... 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
Uncertainty quantification for the extraction of informal roads from remote sensing images of South Africa

Author: Thiede, RN ; Fabris-Rotelli, IN ; Stein, A ; Debba, Pravesh ; Li, M Date: Nov 2019 Informal unpaved roads in developing countries arise naturally through human movement without government authorities being informed. These roads are not authorized nor maintained by council, nor reliably mapped in quality-controlled online ... Read more

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Browsing by Author "Stein, A"

Browsing by Author "Stein, A"

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