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Browsing by Author "Ramoelo, Abel"

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Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa

Author: Majozi, Nobuhle P ; Mannaerts, CM ; Ramoelo, Abel ; Mathieu, Renaud SA ; Nickless, A ; Verhoef, W Date: Jul 2017 Flux towers provide essential terrestrial climate, water, and radiation budget information needed for environmental monitoring and evaluation of climate change impacts on ecosystems and society in general. They are also intended for calibration ... Read more
Apportioning human-induced and climate-induced land degradation: A Case of the Greater Sekhukhune District Municipality

Author: Kgaphola, Motsoko J ; Ramoelo, Abel ; Odindi, J ; Mwenge Kahinda, Jean-Marc ; Seetal, Ashwin R Date: Mar 2023 Land degradation (LD) is a global issue that affects sustainability and livelihoods of approximately 1.5 billion people, especially in arid/semi-arid regions. Hence, identifying and assessing LD and its driving forces (natural and anthropogenic) ... Read more
Assessing the effect of seasonality on leaf and canopy spectra for the discrimination of an alien tree species, Acacia Mearnsii, from co-occurring native species using parametric and nonparametric classifiers

Author: Masemola, Cecilia R ; Cho, Moses A ; Ramoelo, Abel Date: Aug 2019 The tree Acacia mearnsii is native to south-eastern Australia but has become an aggressive invader in many countries. In South Africa, it is a significant threat to the conservation of biomes. Detecting and mapping its early invasion is ... Read more
Assessing the effects of subtropical forest fragmentation on leaf nitrogen distribution using remote sensing data

Author: Cho, Moses A ; Ramoelo, Abel ; Debba, Pravesh ; Mutanga, O ; Mathieu, Renaud SA ; Van Deventer, Heidi ; Ndlovu, N Date: Oct 2013 Subtropical forest loss resulting from conversion of forest to other land-cover types such as grassland, secondary forest, subsistence crop farms and small forest patches affects leaf nitrogen (N) stocks in the landscape. This study explores ... Read more
Assessing the utility WorldView-2 imagery for tree species mapping in a South African subtropical forest patch and the conservation implications: Dukuduku forest patch as case study

Author: Cho, Moses A ; Malahlela, O ; Ramoelo, Abel Date: Jun 2015 Indigenous forest biome in South Africa is highly fragmented into patches of various sizes (most patches < 1 km (sup20). The utilization of timber and non-timber resources by poor rural communities living around protected forest patches produce ... Read more
Bulk feeder or selective grazer: African buffalo space use patterns based on fine-scale remotely sensed data on forage quality and quantity

Author: Kaszta, Z ; Marino, J ; Ramoelo, Abel ; Wolff, E Date: Mar 2016 The distribution and behaviour of African large grazers are regulated primarily from the bottom up, with some species showing clear preferences for certain vegetation types. While the African buffalo (Syncerus caffer) is sometimes considered ... Read more
Comparing parametric and non-parametric classifiers for remote sensing of tree species across a land use gradient in a Savanna landscape

Author: Cho, Moses A ; Naidoo, Laven ; Mathieu, Renaud SA ; Asner, GP ; Ramoelo, Abel Date: Nov 2012 Several classification techniques have been used to map vegetation communities or land cover types using remote sensing data including maximum likelihood (ML), discriminant analysis and spectral angle mapper classifiers. ML classifier is a ... Read more
Comparison of Landsat 8 OLI and Landsat 7 ETM+ for estimating grassland LAI using model inversion and spectral indices: case study of Mpumalanga, South Africa

Author: Masemola, Cecilia ; Cho, Moses A ; Ramoelo, Abel Date: Jun 2016 The leaf area index (LAI) is the key biophysical indicator used to assess the condition of rangeland. In this study, we investigated the implications of narrow spectral response, high radiometric resolution (12 bits), and higher signal-to-noise ... Read more
Comparison of two remote sensing models for estimating evapotranspiration: algorithm evaluation and application in seasonally arid ecosystems in South Africa

Author: Dzikiti, Sebinasi ; Jovanovic, Nebojsa ; Bugan, Richard DH ; Ramoelo, Abel ; Majozi, Nobuhle P ; Nickless, Alecia ; Cho, Moses A ; Le Maitre, David C ; Ntshidi, Zanele ; Pienaar, Harrison H Date: Sep 2019 Remote sensing tools are becoming increasingly important for providing spatial information on water use by different ecosystems. Despite significant advances in remote sensing based evapotranspiration (ET) models in recent years, important ... Read more
Distinguishing between human-induced land degradation from effects of rainfall: Case of The Greater Sekhukhune District Municipality

Author: Kgaphola, Motsoko J ; Ramoelo, Abel ; Odindi, John ; Mwenge Kahinda, Jean-Marc ; Seetal, Ashwin R Date: Nov 2022 Land degradation (LD) is a global issue that affects the sustainability and livelihoods of approximately 1.5 billion people, especially in arid/semi-arid regions. Assessing and identifying LD, especially driven by anthropogenic activities, ... Read more
Dry season biomass estimation as an indicator of rangeland quantity using multi-scale remote sensing data

Author: Ramoelo, Abel ; Cho, Moses A Date: Oct 2014 For grazing, biomass is the main indicator of rangeland quantity, which is crucial to determine the amount of food available for animals (grazers), including livestock. Livestock production in the rural communities of the world, including ... Read more
Earth Observation for Biodiversity Assessment (EO-BA)

Author: Cho, Moses A ; Debba, Pravesh ; Mathieu, Renaud SA ; Ramoelo, Abel ; Naidoo, Laven ; Van Deventer, Heidi ; Malahlela, O ; Mathieu, Renaud SA Date: Oct 2012 The Earth Observation for Biodiversity Assessment (EO-BA) programme is designed to enhance biodiversity assessment and conservation through the application of earth observation data, with particular focus on the African continent. Read more
Earth observation for rangeland monitoring

Author: Ramoelo, Abel ; Cho, Moses A ; Mathieu, Renaud SA Date: Oct 2012 The emergence of high resolution multispectral sensors with red-edge information such as, WorldView-2, RapidEye, Sentinel-2 (to be launched in 2013) and SumbandilaSAT moves remote sensing towards routine monitoring of rangeland resource quality. Read more
Effect of impervious surface area and vegetation changes on mean surface temperature over Tshwane metropolis, Gauteng Province, South Africa

Author: Adeyemi, A ; Botai, J ; Ramoelo, Abel ; van der Merwe, F ; Tsela, P Date: Nov 2015 The Tshwane Metropolis, Gauteng Province, South Africa, continues to experience rapid urbanization as a result of population growth. This has led to the conversion of natural lands into large man-made landscapes i.e., increase in impervious ... Read more
Estimating above ground biomass as an indicator of carbon storage in vegetated wetlands of the grassland biome of South Africa

Author: Naidoo, Laven ; Van Deventer, Heidi ; Ramoelo, Abel ; Mathieu, Renaud ; Nondlazi, Basanda ; Gangat, R Date: Jun 2019 Wetlands store higher carbon content relative to other terrestrial ecosystems, despite the small extent they occupy. The increase in temperature and changes in rainfall pattern may negatively affect their extent and condition, and thus the ... Read more
Estimating grass nutrients and biomass as an indicator of rangeland (forage) quality and quantity using remote sensing in Savanna ecosystems

Author: Ramoelo, Abel ; Cho, Moses A ; Mathieu, Renaud SA ; Skidmore, AK ; Schlerf, M ; Heitkönig, IMA Date: Oct 2012 Grass quality and quantity information plays a crucial role in understanding the distribution, densities and population dynamics of herbivores (i.e. livestock and wildlife). Leaf nitrogen (N) and biomass (g/ m2) are indicators of grass quality ... Read more
Estimating tree species diversity in the savannah using NDVI and woody canopy cover

Author: Madonsela, Sabelo ; Cho, Moses A ; Ramoelo, Abel ; Mutanga, O ; Naidoo, Laven Date: Apr 2018 Remote sensing applications in biodiversity research often rely on the establishment of relationships between spectral information from the image and tree species diversity measured in the field. Most studies have used normalized difference ... Read more
Explaining Leaf Nitrogen Distribution in a Semi-Arid Environment Predicted on Sentinel-2 Imagery Using a Field Spectroscopy Derived Model

Author: Ramoelo, Abel ; Cho, Moses A Date: Feb 2018 Leaf nitrogen concentration (leaf N, %) is an essential component for understanding biogeochemical cycling. Leaf N is a good indicator of grass or forage quality, which is important for understanding the movements and feeding patterns of ... Read more
Forage quality and availability for large herbivores in Southern African rangelands

Author: Stolter, C ; Ramoelo, Abel ; Kesch, K ; Madibela, OR ; Cho, Moses A ; Joubert, DF Date: Apr 2018 In light of the growing human population, the pressure on herbivores (livestock and wild herbivores) will be accelerated, resulting in a need for effective land management. To achieve this, information and knowledge about the availability and ... Read more
Herbaceous biomass predication from environmental and remote sensing indicators

Author: Dudeni-Tlhone, N ; Ramoelo, Abel ; Debba, Pravesh ; Cho, Moses A ; Mathieu, Renaud SA Date: Nov 2012 Feeding patterns and distribution of herbivores animals are known to be influenced by quality and quantity of forage such as grass. Modelling indicators of grass quality and biomass are critical in understanding such patterns and for decision ... Read more

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