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Browsing by Author "Steenkamp, Karen C"

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Detecting inter-annual variability in the phenological characteristics of southern Africa’s vegetation using satellite imagery

Author: Wessels, Konrad J ; Steenkamp, Karen C ; Von Maltitz, Graham P ; Archibald, S Date: 2011 Vegetation phenology refers to the timing of seasonal biological events (for example, bud burst, leaf unfolding, vegetation growth and leaf senescence) and biotic and abiotic forces that control these. Daily, coarse-resolution satellite imagery ... 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
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
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
Long-term phenology and variability of Southern Africa

Author: Steenkamp, Karen C ; Wessels, Konrad J ; Archibald, S ; Von Maltitz, Graham P Date: Nov 2008 Satellite-derived phenology allows monitoring of terrestrial vegetation on a global scale and provides an integrative view at the landscape level. Understanding these seasonal phenological patterns is essential to (i) the characterisation and ... Read more
Mapping and monitoring fractional woody vegetation cover in the arid savannas of Namibia using LiDAR training data, machine learning and ALOS PALSAR data

Author: Wessels, Konrad J ; Mathieu, Renaud ; Knox, N ; Main, Russell S ; Naidoo, Laven ; Steenkamp, Karen C Date: Nov 2019 Namibia is a very arid country, but experienced significant bush encroachment which has decreased ivestock productivity. Therefore, it is essential to monitor bush encroachment and widespread debushing activities. The aim of study was to ... Read more
Quantitative comparison of fire danger index performance using fire activity

Author: Steenkamp, Karen C ; Wessels, Konrad J ; Van den Bergh, F ; McFerren, GA ; Frost, PE ; Lai, CW ; Swanepoel, D Date: Jul 2012 Fire danger indices (FDI) describe the conditions that influence ease of ignition, rate of spread and the impact caused by fires. It is used to assess the safety of prescribed burning activities, to improve real-time fire fighting preparedness ... 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
Remotely sensed phenology for mapping biomes and vegetation functional types

Author: Wessels, Konrad J ; Steenkamp, Karen C ; Von Maltitz, Graham P ; Archibald, S ; Scholes, RJ ; Miteff, S ; Bachoo, A Date: Jul 2009 This study used remotely-sensed phenology data derived from Advanced Very High Resolution Radiometer (AVHRR), in a fully supervised decision-tree classification based on the new biome map of South Africa. The objectives were: (i) to investigate ... Read more
Remotely sensed vegetation phenology for describing and predicting the biomes of South Africa

Author: Wessels, Konrad J ; Steenkamp, Karen C ; Von Maltitz, Graham P ; Archibald, S Date: Feb 2011 What are the patterns of remotely sensed vegetation phenology, including their inter-annual variability, across South Africa? What are the phenological attributes that contribute most to distinguishing the different biomes? How well can the ... Read more
Satellite derived phenology of southern Africa for 1985-2000 and functional classification of vegetation based on phenometrics

Author: Steenkamp, Karen C ; Wessels, Konrad J ; Archibald, S ; Von Maltitz, Graham P Date: May 2009 Remotely-sensed phenological metrics (or phenometrics) were derived from AVHRR vegetation-index time-series data and to describes seasonal growth in terms of start, end, length of season and estimates of net primary production (NPP). This ... 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

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Browsing by Author "Steenkamp, Karen C"

Browsing by Author "Steenkamp, Karen C"

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All of ResearchSpace

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