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Browsing by Author "Salmon, BP"

Now showing items 4-23 of 41

A CA-CFAR and localized wavelet ship detector for sentinel-1 imagery

Author: Schwegmann, CP ; Kleynhans, W ; Salmon, BP ; Mdakane, L Date: Jul 2015 The Maritime Domain Awareness initiative seeks to constantly improve the ways in which maritime information is collected. With the recent release of free Sentinel-1 imagery to the public, monitoring the maritime environment has become a more ... 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
Comparison of feature extraction methods within a spatio-temporal land cover change detection framework

Author: Kleynhans, W ; Salmon, BP ; Olivier, JC ; Wessels, Konrad J ; Van den Bergh, F Date: Jul 2011 In this paper, a change detection accuracy comparison is made between a recently proposed EKF method and a sliding window. Fast Fourier Transform(FFT) alternative within a spatio-temporal change detection framework. Both methods produce a ... Read more
Detecting land cover change by evaluating the internal covariance matrix of the extended Kalman filter

Author: Salmon, BP ; Kleynhans, W ; Van den Bergh, F ; Olivier, JC ; Wessels, Konrad J Date: Jul 2012 In this paper, the internal operations of an Extended Kalman Filter is investigated to see if any useful information can be derived to detect land cover change in a MODIS time series. The Extended Kalman Filter expands its internal covariance ... Read more
Detecting land cover change using a sliding window temporal autocorrelation approach

Author: Kleynhans, W ; Salmon, BP ; Olivier, JC ; Van den Bergh, F ; Wessels, Konrad J ; Grobler, T Date: Jul 2012 There has been recent developments in the use of hypertemporal satellite time series data for land cover change detection and classification. Recently, an Autocorrelation function (ACF) change detection method was proposed to detect the ... 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
The development of deep learning in synthetic aperture radar imagery

Author: Schwegmann, Colin P ; Kleynhans, Waldo ; Salmon, BP Date: May 2017 The usage of remote sensing to observe environments necessitates interdisciplinary approaches to derive effective, impactful research. One remote sensing technique, Synthetic Aperture Radar, has shown significant benefits over traditional ... Read more
Implementation and testing of WELD and automatic spectral rule-based classifications for Landsat ETM+ in South Africa

Author: Wessels, Konrad J ; Salmon, BP ; Van den Bergh, F ; Steenkamp, Karen C ; Kleynhans, W ; Swanepoel, D ; Kleyn, L ; Roy, DP ; Kovalskyy, V Date: Apr 2013 The Web-enabled Landsat Data (WELD) system was successfully installed in South Africa (SA) and used for pre-processing large amounts of Landsat ETM+ data to composited seasonal mosaics. In pursuit of automated land cover mapping, the overall ... 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
Improving NDVI time series class separation using an extended Kalman filter

Author: Kleynhans, W ; Olivier, JC ; Salmon, BP ; Wessels, Konrad J ; Van den Bergh, F Date: Jul 2009 It is proposed that the NDVI time series derived from MODIS multitemporal remote sensing data can be modelled as a triply (mean, phase and amplitude) modulated cosine function. A non-linear Extended Kalman Filter was developed to estimate the ... 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
Meta-optimization of the extended kalman filter's parameters for improved feature extraction on hyper-temporal images

Author: Salmon, BP ; Kleynhans, W ; Van den Bergh, F ; Olivier, JC ; Marais, WJ ; Wessels, Konrad J Date: Jul 2011 Time series derived from the first two spectral bands of the MODerate-resolution Imaging Spectroradiometer (MODIS) land surface reflectance product can be modelled as a pair of triply (mean, phase and amplitude) modulated cosine functions. ... Read more
Modified temporal approach to meta-optimizing an extended Kalman filter's parameters

Author: Salmon, BP ; Kleynhans, Waldo ; Olivier, JC ; Olding, WC ; Wessels, Konrad J ; Van den Bergh, Frans Date: Jul 2014 It has been shown that time series containing reflectance values from the first two spectral bands of the MODerateresolution Imaging Spectroradiometer (MODIS) land surface reflectance product can be modelled as a triply modulated cosine ... 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
A multi-tier higher order Conditional Random Field for land cover classification of multi-temporal multi-spectral Landsat imagery

Author: Salmon, BP ; Kleynhans, W ; Olivier, JC ; Schwegmann, CP ; Olding, WC Date: Jul 2015 In this paper the authors present a 2-tier higher order Conditional Random Field which is used for land cover classification. The Conditional Random Field is based on probabilistic messages being passed along a graph to compute efficiently ... Read more
A novel Spatio-temporal change detection approach using hyper-temporal satellite data

Author: Kleynhans, W ; Salmon, BP ; Wessels, Konrad J Date: Jul 2014 The use of hyper-temporal MODIS time-series data for the detection of land cover change in South Africa has been an active research area the last few year. This paper expands on previous studies that show that this type of data can be effectively ... Read more
Proper comparison among methods using a confusion matrix

Author: Salmon, BP ; Kleynhans, W ; Schwegmann, CP ; Olivier, JC Date: Jul 2015 An important aspect of research in the remote sensing field is to objectively compare different classifiers. This is the foundation of hundreds of research projects and in this paper we will address some raising concerns when evaluating ... Read more
Quest for automated land cover change detection using satellite time series data

Author: Salmon, BP ; Olivier, JC ; Kleynhans, W ; Wessels, Konrad J ; Van den Bergh, F Date: Jul 2009 This paper shows that a feedforward Multilayer Perceptron (MLP) operating over a temporal sliding window of multispectral time series MODerate-resolution Imaging Spectroradiometer (MODIS) satellite data is able to detect land cover change ... Read more

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