Browsing Journal Articles by Author "Salmon, BP"

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Applying model parameters as a driving force to a deterministic nonlinear system to detect land cover change

Author: Salmon, BP ; Holloway, DS ; Kleynhans, Waldo ; Olivier, JC ; Wessels, Konrad J Date: Sep 2017 In this paper, we propose a new method for extracting features from time-series satellite data to detect land cover change. We propose to make use of the behavior of a deterministic nonlinear system driven by a time-dependent force. The driving ... Read more
Cavalieri integration

Author: Ackermann, ER ; Grobler, TL ; Kleynhans, W ; Olivier, JC ; Salmon, BP ; Van Zyl, AJ Date: Sep 2012 We use Cavalieri’s principle to develop a novel integration technique which we call Cavalieri integration. Cavalieri integrals differ from Riemann integrals in that non-rectangular integration strips are used. In this way we can use single ... 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
Detecting settlement expansion using hyper-temporal SAR time-series

Author: Kleynhans, W ; Salmon, BP Date: Jul 2014 The detection of new informal settlements in South Africa using time-series data derived from coarse resolution satellite imagery has recently been an active area of research. Most of the previous methods presented using hyper-temporal satellite ... Read more
Manifold adaptation for constant false alarm rate ship detection in South African oceans

Author: Schwegmann, CP ; Kleynhans, W ; Salmon, BP Date: Apr 2015 The detection of ships at sea is a difficult task made more so by uncooperative ships, especially when using transponder based ship detection systems. Synthetic Aperture Radar imagery provides a means of observation independent of the ships ... Read more
A modified temporal criterion to meta-optimize the extended Kalman filter for land cover classification of remotely sensed time series

Author: Salmon, BP ; Kleynhans, Waldo ; Olivier, JC ; Van den Bergh, Frans ; Wessels, Konrad J Date: May 2018 Humans are transforming land cover at an ever-increasing rate. Accurate geographical maps on land cover, especially rural and urban settlements are essential to planning sustainable development. Time series extracted from MODerate resolution ... 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
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
Wu’s algorithm and its possible application in cryptanalysis

Author: Grobler, TL ; Van Zyl, AJ ; Olivier, JC ; Kleynhans, W ; Salmon, BP ; Penzhorn, WT Date: Jan 2012 In this paper we reviewed Wu’s algorithm and introduced it as a cryptanalysis technique. This study reveals that when Wu’s algorithm is used for cryptanalysis it simplifies. This is true because Wu’s algorithm has to be applied to binary ... Read more

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Browsing Journal Articles by Author "Salmon, BP"

Browsing Journal Articles by Author "Salmon, BP"

Browse

All of ResearchSpace

This Collection

Quick Links

Legislation and compliance

General Enquiries

Social Connect