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Browsing by Subject "Change detection"

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Assessing post apartheid settlement growth patterns using remote sensing and GIWS: A case study of Cape Town metropolitan area

Author: Pillay, DL ; Sebake, MD Date: Nov 2008 The significant land-use change in South African metropolitan areas, due to urbanization, created challenges of spatial development planning, infrastructure and service provision. This paper outlines the change detection analysis method applied ... 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
Change detection of bare areas in the Xolobeni region, South Africa using Landsat NDVI

Author: Singh, RG ; Engelbrecht, Jeanine ; Kemp, J Date: Jun 2015 Identification and protection of areas that are vulnerable to erosion is essential for the conservation of the sensitive wetlands and estuarine ecosystems along the Xolobeni coastal strip. The forecasting of these erosion susceptible areas ... Read more
Comparing three spaceborne optical sensors via fine scale pixel-based urban land cover classification products

Author: Breytenbach, Andre ; Eloff, C ; Pretorius, E Date: Aug 2013 Accessibility to higher resolution earth observation satellites suggests an improvement in the potential for fine scale image classification. In this comparative study, imagery from three optical satellites (WorldView-2, Pléiades and RapidEye) ... Read more
Detecting land cover change using an extended Kalman filter on MODIS NDVI time-series data

Author: Kleynhans, W ; Olivier, JC ; Wessels, Konrad J ; Salmon, BP ; Van den Bergh, F ; Steenkamp, Karen C Date: May 2011 A method for detecting land cover change using NDVI time-series data derived from 500-m MODIS satellite data is proposed. The algorithm acts as a per-pixel change alarm and takes the NDVI time series of a 3 × 3 grid of MODIS pixels as the ... Read more
Detecting settlement expansion in South Africa using a hyper-temporal SAR change detection approach

Author: Kleynhans, W ; Salmon, BP ; Olivier, JC Date: Oct 2015 Recent times have seen a significant increase in the amount of readily available SAR data, with many current and historic SAR data holdings now adopting an open distribution policy. As more regular SAR observations are becoming available, the ... Read more
Improving features used for hyper-temporal land cover change detection by reducing the uncertainty in the feature extraction method

Author: Salmon, BP ; Kleynhans, Waldo ; Olivier, JC ; Schwegmann, Colin P Date: Jul 2017 The well-being of the environment is one of the major factors that contributes to sustainability. Sustainable human settlements require local governance to plan, implement, develop, and manage human settlements expansions. This is important ... Read more
Land Cover Change Detection Using Autocorrelation Analysis on MODIS Time-Series Data: Detection of New Human Settlements in the Gauteng Province of South Africa

Author: Kleynhans, Waldo ; Salmon, Brian P ; Olivier, JC ; Van den Bergh, Frans ; Wessels, Konrad J ; Grobler, Trienko L ; Steenkamp, Karen C Date: 2012 Autocorrelation Change detection MODIS Timeseries Read more
Limits to detectability of land degradation by trend analysis of vegetation index data

Author: Wessels, Konrad J ; Van den Bergh, F ; Scholes, RJ Date: Oct 2012 This paper demonstrates a simulation approach for testing the sensitivity of linear and non-parametric trend analysis methods applied to remotely sensed vegetation index data for the detection of land degradation. The intensity, rate and ... Read more
Monitoring of Savanna degradation in Namibia using landsat TM/ETM+ data

Author: Lück-Vogel, Melanie ; Strohbach, M Date: Jul 2009 Detection and quantification of degradation processes as a first step for understanding and development of prevention and mitigation actions is of international interest as the described processes are observed in semi-arid landscapes globally. ... Read more
Rapid detection of new and expanding human settlements in the Limpopo province of South Africa using a spatio-temporal change detection method

Author: Kleynhans, W ; Salmon, BP ; Wessels, Konrad J ; Olivier, JC Date: Aug 2015 Recent development has identified the benefits of using hyper-temporal satellite time series data for land cover change detection and classification in South Africa. In particular, the monitoring of human settlement expansion in the Limpopo ... Read more
Rapid land cover map updates using change detection and robust random forest classifiers

Author: Wessels, Konrad J ; Van den Bergh, F ; Roy, DP ; Salmon, BP ; Steenkamp, Karen C ; MacAlister, B ; Swanepoel, D ; Jewit, D Date: 2016 The paper evaluated the Landsat Automated Land Cover Update Mapping (LALCUM) system designed to rapidly update a land cover map to a desired nominal year using a pre-existing reference land cover map. The system uses the Iteratively Reweighted ... Read more
Transforming the autocorrelation function of a time series to detect land cover change

Author: Salmon, BP ; Kleynhans, Waldo ; Olivier, JC ; Schwegmann, Colin P Date: Jul 2015 Regional monitoring of land cover conversion of natural vegetation to new informal human settlements is essential when investigating the migration of people to urbanized cities. Detecting these new settlements require reliable change detection ... Read more
Unsupervised land cover change detection: meaningful sequential time series analysis

Author: Salmon, BP ; Olivier, JC ; Wessels, Konrad J ; Kleynhans, W ; Van den Bergh, F ; Steenkamp, Karen C Date: Jun 2011 An automated land cover change detection method is proposed that uses coarse spatial resolution hyper-temporal earth observation satellite time series data. The study compared three different unsupervised clustering approaches that operate ... Read more
The use of a multilayer perceptron for detecting new human settlements from a time series of MODIS images

Author: Salmon, BP ; Olivier, JC ; Kleynhans, W ; Wessels, Konrad J ; Van den Bergh, F ; Steenkamp, Karen C Date: Dec 2011 This paper presents a novel land cover change detection method that employs a sliding window over hyper-temporal multi-spectral images acquired from the 7 bands of the MODerate-resolution Imaging Spectroradiometer (MODIS) land surface reflectance ... Read more
Using exponentially weighted moving average algorithm to defend against DDoS attacks

Author: Machaka, P ; Bagula, A ; Nelwamondo, Fulufhelo V Date: Nov 2016 This paper seeks to investigate the performance of the Exponentially Weighted Moving Average (EWMA) for mining big data and detection of DDoS attacks in Internet of Things (IoT) infrastructure. The paper will investigate the tradeoff between ... Read more
Using the cumulative sum algorithm against distributed denial of service attacks in Internet of Things

Author: Machaka, Pheeha ; McDonald, Andre M ; Nelwamondo, Fulufhelo V ; Bagula, A Date: Nov 2015 The paper presents the threats that are present in Internet of Things (IoT) systems and how they can be used to perpetuate a large scale DDoS attack. The paper investigates how the Cumulative Sum (CUSUM) algorithm can be used to detect a DDoS ... Read more
What lies beneath: detecting sub-canopy changes in savanna woodlands using a three-dimensional classification method

Author: Fisher, JT ; Witkowski, TF ; Erasmus, BFN ; Mograbi, PJ ; Asner, GP ; Van Aardt, JAN ; Wessels, Konrad J ; Mathieu, Renaud SA Date: Jul 2015 Question: Increasing population pressure, socio-economic development and associated natural resource use in savannas are resulting in large-scale land cover changes, which can be mapped using remote sensing. Is a three-dimensional (3D) woody ... Read more

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