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Browsing by Author "Naidoo, Laven"

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An above-ground biomass map of African savannahs and woodlands at 25m resolution derived from ALOS PALSAR

Author: Bouvet, A ; Mermoz, S ; Le Toan, T ; Villard, L ; Mathieu, Renaud SA ; Naidoo, Laven ; Asner, GP Date: Mar 2018 Savannahs and woodlands are among the most important biomes in Africa: they cover half of sub-Saharan Africa, provide vital ecosystem services to the rural communities, and play a major part in the carbon budget. Despite their importance and ... Read more
Aboveground biomass density models for NASA’s Global Ecosystem Dynamics Investigation (GEDI) lidar mission

Author: Duncanson, L ; Kellner, JR ; Armston, J ; Dubayah, R ; Minora, DM ; Hancock, S ; Healey, SP ; Patterson, PL ; Main, Russell S ; Naidoo, Laven Date: Mar 2022 NASA’s Global Ecosystem Dynamics Investigation (GEDI) is collecting spaceborne full waveform lidar data with a primary science goal of producing accurate estimates of forest aboveground biomass density (AGBD). This paper presents the development ... Read more
The assessment of data mining algorithms for modelling Savannah woody cover using multi-frequency (X-, C- and L-band) synthetic aperture radar (SAR) datasets

Author: Naidoo, Laven ; Mathieu, Renaud SA ; Kleynhans, W ; Wessels, Konrad J ; Asner, GP ; Leblon, B Date: Jul 2014 The woody component in African Savannahs provides essential ecosystem services such as fuel wood and construction timber to large populations of rural communities. Woody canopy cover (i.e. the percentage area occupied by woody canopy or CC) ... Read more
Assessment of the mapping of fractional woody cover in southern African savannas using multi-temporal and polarimetric ALOS PALSAR L-band images

Author: Urbazaev, M ; Thiel, C ; Mathieu, Renaud SA ; Naidoo, Laven ; Levick, SR ; Smit, IPJ ; Asner, GP ; Schmullius, C Date: Sep 2015 Woody vegetation cover affects several ecosystem processes including carbon and water cycling, energy fluxes, and fire regimes. In order to understand the dynamics of savanna ecosystems, information on the spatial distribution of woody ... Read more
Classification of savanna tree species, in the Greater Kruger National Park region, by integrating hyperspectral and LiDAR data in a random forest data mining environment

Author: Naidoo, Laven ; Cho, Moses A ; Mathieu, Renaud SA ; Asner, G Date: Apr 2012 The accurate classification and mapping of individual trees at species level in the savanna ecosystem can provide numerous benefits for the managerial authorities. Such benefits include the mapping of economically useful tree species, which ... 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
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
The Effect of Surface Fire in Savannah Systems in the Kruger National Park (KNP), South Africa, on the Backscatter of C-Band Sentinel-1 Images

Author: Mathieu, Renaud ; Main, Russell S ; Roy, DP ; Naidoo, Laven ; Yang, H Date: Jun 2019 Savannahs are mixed woody-grass communities where low-intensity surface fires are common, affecting mostly the grass layer and rarely damaging trees. We investigated the effect of surface fires in a savannah system in the Kruger National Park, ... 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 South African maize biomass using integrated high-resolution UAV and sentinel 1 and 2 datasets

Author: Naidoo, Laven ; Main, Russell S ; Cho, Moses A ; Madonsela, Sabelo ; Majozi, Nobuhle, P Date: Jul 2021 Sentinel-1 and Sentinel-2 have provided consistent hyper-temporal information (5–7 days or earlier) at high spatial resolutions (10m) on biophysical composition, structural and physiological conditions of crops in a variety of environments. ... 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
Exploring the utility of Sentinel-2 for estimating maize chlorophyll content and leaf area index across different growth stages

Author: Madonsela, Sabelo ; Cho, Moses A ; Naidoo, Laven ; Main, Russell S ; Majozi, Nobuhle P Date: Dec 2021 This study investigated the utility of Sentinel-2 spectral data for estimating leaf area index (LAI), leaf and canopy chlorophyll content of maize at different growth stages. Vegetation indices based on the visible-near infrared and red-edge ... Read more
Hyper-temporal c-band SAR for baseline woody structural assessments in deciduous savannas

Author: Main, Russell S ; Mathieu, Renaud SA ; Kleynhans, W ; Wessels, Konrad J ; Naidoo, Laven ; Asner, GP Date: Aug 2016 Savanna ecosystems and their woody vegetation provide valuable resources and ecosystem services. Locally calibrated and cost effective estimates of these resources are required in order to satisfy commitments to monitor and manage change ... Read more
Identifying the best season for mapping evergreen swamp and mangrove species using leaf-level spectra in an estuarine system in KwaZulu-Natal, South Africa

Author: Van Deventer, Heidi ; Cho, Moses A ; Mutanga, O ; Naidoo, Laven ; Dudeni-Tlhone, N Date: Oct 2014 Swamp and mangrove forests are some of the most threatened forest types in the world. In Africa, these forests are essential in providing food, construction material and medicine to people. These forest types have not sufficiently been mapped ... Read more
Improving discrimination of savanna tree species through a multiple endmember spectral-angle-mapper (SAM) approach: canopy level analysis

Author: Cho, Moses A ; Debba, Pravesh ; Mathieu, Renaud SA ; Naidoo, Laven ; Van Aardt, J ; Asner, G Date: Nov 2010 Differences in within-species phenology and structure are controlled by genetic variation, as well as topography, edaphic properties, and climatic variables across the landscape and present important challenges to species differentiation with ... Read more
Indirect estimation of structural parameters in South African forests using MISR-HR and LiDAR remote sensing data

Author: Mahlangu, Precious N ; Mathieu, Renaud SA ; Wessels, Konrad J ; Naidoo, Laven ; Verstraete, M ; Asner, G ; Main, Russell S Date: Sep 2018 Forest structural data are essential for assessing biophysical processes and changes, and promoting sustainable forest management. For 18+ years, the Multi-Angle Imaging SpectroRadiometer (MISR) instrument has been observing the land surface ... Read more
Machine learning modelling of crop structure within the Maize Triangle of South Africa

Author: Naidoo, Laven ; Main, Russell S ; Cho, Moses A ; Madonsela, Sabelo ; Majozi, Nobuhle, P Date: Jan 2022 Maize has been identified as a strategic commodity for the reduction of poverty and enhancement of food security in the African continent. Climate variability and difficult economic conditions are pressuring farmers to produce higher (maize) ... 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
A radar and LiDAR-based earth observation system for monitoring savanna woody structure in southern Africa

Author: Mathieu, Renaud ; Wessels, Konrad ; Main, Russell S ; Naidoo, Laven ; Van der Bergh, Frans ; Erasmus, Barend Date: Apr 2018 In southern Africa, landscapes are dominated by savannas, i.e., mixed tree-grass communities. These savannas are threatened by land clearing and degradation, as well as the densification of woody plants, a process known as bush encroachment. ... Read more
Remote sensing research for spatial assessment of woody structure in African savannahs & woodlands –past, on-going, and future work by the CSIR

Author: Mathieu, Renaud SA ; Naidoo, Laven ; Cho, Moses A ; Wessels, Konrad J ; Asner, GP Date: Apr 2011 Appropriate techniques are needed to monitor woody vegetation cover, biomass and carbon stocks. Light Detection and Ranging (LiDAR) & Synthetic Aperture Radar (SAR) interact with vegetation morphology and structure. The aim of this study is ... Read more

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