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Browsing Journal Articles 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
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
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
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 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
The impact of the quality of coal mine stockpile soils on sustainable vegetation growth and productivity

Author: Mushia, NM ; Ramoelo, Abel ; Ayisi, KK Date: Jun 2016 Stockpiled soils are excavated from the ground during mining activities, and piled on the surface of the soil for rehabilitation purposes. These soils are often characterized by low organic matter (SOM) content, low fertility, and poor physical, ... Read more
An intercomparison of satellite-based daily evapotranspiration estimates under different eco-climatic regions in South Africa

Author: Majozi, Nobuhle P ; Mannaerts, CM ; Ramoelo, Abel ; Mathieu, Renaud SA ; Mudau, Azwitamisi E ; Verhoef, W Date: Mar 2017 Knowledge of evapotranspiration (ET) is essential for enhancing our understanding of the hydrological cycle, as well as for managing water resources, particularly in semi-arid regions. Remote sensing offers a comprehensive means of monitoring ... Read more
Investigating the relationship between tree species diversity and landsat-8 spectral heterogeneity across multiple phenological stages

Author: Madonsela, Sabelo ; Cho, Moses A ; Ramoelo, Abel ; Mutanga, O Date: Jun 2021 The emergence of the spectral variation hypothesis (SVH) has gained widespread attention in the remote sensing community as a method for deriving biodiversity information from remotely sensed data. SVH states that spectral heterogeneity on ... Read more
An investigation into robust spectral indices for leaf chlorophyll estimation

Author: Main, Russell S ; Cho, Moses A ; Mathieu, Renaud SA ; O'Kennedy, Maretha M ; Ramoelo, Abel ; Koch, S Date: Nov 2011 Quantifying photosynthetic activity at the regional scale can provide important information to resource managers, planners and global ecosystem modelling efforts. With increasing availability of both hyperspectral and narrow band multispectral ... Read more
Monitoring grass nutrients and biomass as indicators of rangeland quality and quantity using random forest modelling and WorldView-2 data

Author: Ramoelo, Abel ; Cho, Moses A ; Mathieu, Renaud SA ; Madonsela, S ; van de Kerchove, R ; Kaszta, Z ; Wolff, E Date: Dec 2015 Land use and climate change could have huge impacts on food security and the health of various ecosystems. Leaf nitrogen (N) and above-ground biomass are some of the key factors limiting agricultural production and ecosystem functioning. Leaf ... Read more
Multi-phenology WorldView-2 imagery improves remote sensing of savannah tree species

Author: Madonsela, Sabelo ; Cho, Moses A ; Mathieu, Renaud SA ; Mutanga, O ; Ramoelo, Abel ; Kaszta, Z ; Van De Kerchove, R ; Wolff, E Date: Jun 2017 Biodiversity mapping in African savannah is important for monitoring changes and ensuring sustainable use of ecosystem resources. Biodiversity mapping can benefit from multi-spectral instruments such as WorldView-2 with very high spatial ... Read more
Non-linear partial least square regression increases the estimation accuracy of grass nitrogen and phosphorus using in situ hyperspectral and environmental data

Author: Ramoelo, Abel ; Skidmore, AK ; Cho, Moses A ; Mathieu, Renaud SA ; Heitkönig, IMA ; Dudeni-Tlhone, N ; Schlerf, M ; Prins, HHT Date: Jun 2013 Grass nitrogen (N) and phosphorus (P) concentrations are direct indicators of rangeland quality and provide imperative information for sound management of wildlife and livestock. It is challenging to estimate grass N and P concentrations using ... 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
The potential of Sentinel-2 spectral configuration to assess rangeland quality

Author: Ramoelo, Abel ; Cho, Moses A ; Mathieu, Renaud SA ; Skidmore, AK Date: Aug 2015 Sentinel-2 is intended to improve vegetation assessment at local to global scales. Today, estimation of leaf nitrogen (N) as an indicator of rangeland quality is possible using hyperspectral systems. However, few studies based on commercial ... Read more

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