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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
Canopy structure in savannas along a moisture gradient on Kalahari sands

Author: Scholes, RJ ; Frost, PGH ; Tian, Y Date: Mar 2004 Measurements of tree canopy architecture were made at six savanna sites on deep, sandy soils, along a gradient of increasing aridity. There was substantial variation in the leaf area estimated within each site, using the same sample frame, ... Read more
Detection of land cover change using an Artificial Neural Network on a time-series of MODIS satellite data

Author: Olivier, JC ; Araya, ST ; Wessels, Konrad J Date: Nov 2007 An Artificial Neural Network (ANN) is proposed to detect human-induced land cover change using a sliding window through a time-series of Moderate Resolution Imaging Spectroradiometer (MODIS) satellite surface reflectance pixel values. Training ... Read more
Efficient temporal access of satellite image data

Author: Bachoo, A ; Van Den Bergh, F ; Gazendam, AD Date: Nov 2008 A single tile from the gridded MODIS products, spanning a region of interest of approximately 10° by 10°, is stored as an image containing close to six million pixels, with data in multiple spectral bands for each pixel. Time series analyses ... Read more
Estimates of the aerosol optical depth over Pretoria using the CSIR mobile lidar

Author: Shikwambana, L ; Sivakumar, V Date: Sep 2013 This study shows the estimates of aerosol optical depth measured over Pretoria, South Africa, using the CSIR-NLC mobile LIDAR. The measurements are also compared with observations from the Level-3 MODIS aerosol optical depth (AOD) data. The ... Read more
Evaluation of MODIS gross primary productivity for Africa using eddy covariance data

Author: Sjöström, M ; Zhao, M ; Archibald, S ; Arneth, A ; Cappelaere, B ; Falk, U ; De Grandcourt, A ; Hanan, N ; Kergoat, L ; Kutsch, W ; Merbold, L ; Mougin, E ; Nickless, A ; Nouvellon, A ; Scholes, RJ ; Veenendaal, EM ; Ardö, J Date: Apr 2013 MOD17A2 provides operational gross primary production (GPP) data globally at 1 km spatial resolution and 8-day temporal resolution. MOD17A2 estimates GPP according to the light use efficiency (LUE) concept assuming a fixed maximum rate of ... 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
Land-cover separability analysis of MODIS time-series data using a combined simple harmonic oscillator and a mean reverting stochastic process

Author: Grobler, TL ; Ackermann, ER ; Olivier, JC ; Van Zyl, AJ ; Kleynhans, W Date: Jun 2012 It is proposed that the time series extracted from moderate resolution imaging spectroradiometer satellite data be modeled as a simple harmonic oscillator with additive colored noise. The colored noise ismodeled with an Ornstein–Uhlenbeck ... 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
Multi-threaded compression of Earth observation time-series data

Author: Swanepoel, Derick ; Van den Bergh, Frans Date: Mar 2017 Earth observation data are typically compressed using general-purpose single-threaded compression algorithms that operate at a fraction of the bandwidth of modern storage and processing systems. We present evidence that recently developed ... 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
On the warm nearshore bias in Pathfinder monthly SST products over Eastern Boundary upwelling systems

Author: Dufois, F ; Penven, P ; Whittle, CP ; Veitch, J Date: 2012 Using in situ sea surface temperature (SST) data and MODIS/TERRA SST, the monthly AVHRR Pathfinder (version 5.0 and 5.2) SST product was evaluated within the four main Eastern Boundary Upwelling Systems. A warm bias in the monthly Pathfinder ... Read more
Optimal dates for assessing long-term changes in tree cover in the semi-arid biomes of South Africa using MODIS NDVI time series (2001-2018)

Author: Cho, Moses A ; Ramoelo, Abel Date: Sep 2019 The varying proportions of tree and herbaceous cover in the grassland and savanna biomes of Southern Africa determine their capacity to provide ecosystem services. The asynchronous phenologies e.g. annual NDVI profiles of grasses and trees ... Read more
Relevance of rangeland degradation in semiarid Northeastern South Africa to the nonequilibrium theory

Author: Wessels, Konrad J ; Prince, SD ; Carroll, M ; Malherbe, Johan Date: Apr 2007 According to the nonequilibrium theory, livestock grazing has a limited effect on long-term vegetation productivity of semiarid rangelands, which is largely determined by rainfall. The communal lands in northeastern South Africa contain ... 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
Using Page’s cumulative sum test on MODIS time series to detect land-cover changes

Author: Grobler, TL ; Ackermann, ER ; Van Zyl, AJ ; Olivier, JC ; Kleynhans, Waldo ; Salmon, Brian P Date: 2012 Human settlement expansion is one of the most pervasive forms of land-cover change in South Africa. The use of Page’s cumulative sum (CUSUM) test is proposed as a method to detect new settlement developments in areas that were previously ... Read more
Validation of the MODIS burned-area products across different biomes in South Africa

Author: Tsela, PL ; Van Helden, P ; Frost, P ; Wessels, Konrad J ; Archibald, S Date: Jul 2010 The Moderate Resolution Imaging Spectroradiometer (MODIS) time-series data afford the remote sensing community a unique opportunity to investigate the frequency and distribution of fires. Previous research that validated the MODIS burned area ... Read more

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