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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
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
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
Satellite imager calibration and validation

Author: Vhengani, L ; Lubbe, M ; Griffith, D ; Lysko, M Date: Oct 2010 The success or failure of any earth observation mission depends on the quality of its data. Data quality is assessed by determining the radiometric, spatial, spectral and geometric fidelity of the satellite sensor. The process is termed calval. ... Read more
South Africa’s Space Programme of the mid-1980s to mid-1990s: Driver towards a South African Titanium Industry

Author: Du Preez, W Date: Oct 2010 This presentation deals with South Africa’s Space Programme from the mid-1980s to mid-1990s, and discussed the South African Titanium Industry in particular. The talk shows how the SA Titanium Industry supports the current South African Space ... Read more

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Browsing by Subject "Satellites"

Browsing by Subject "Satellites"

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