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Browsing by Author "Van Aardt, JAN"

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Assessing degradation across a land-use gradient in the Kruger National Park area using advanced remote sensing modalities

Author: Van Aardt, JAN ; Mathieu, Renaud SA ; Cho, Moses A ; Wessels, Konrad J ; Erasmus, B ; Asner, GP ; Smit, IPJ Date: 2011 Land degradation is regarded as one of the most important environmental issues facing sub-Saharan Africa and is especially relevant in the former communal ‘homeland’ areas of South Africa. Although it has been a topic of intense research, ... Read more
Examining pine spectral separability using hyperspectral data from an airborne sensor : an extension of field-based results

Author: Van Aardt, JAN ; Wynne, RH Date: Jan 2007 Three southern USA forestry species, loblolly pine (Pinus taeda), Virginia pine (Pinus virginiana), and shortleaf pine (Pinus echinata), were previously shown to be spectrally separable (83% accuracy) using data from a full-range spectro-radiometer ... Read more
Forest volume and biomass estimation using small-footprint lidar-distributional parameters on a per-segment basis

Author: Van Aardt, JAN ; Wynne, RH ; Oderwald, RG Date: May 2006 This study assessed a lidar-based, object-oriented (segmentation) approach to forest volume and aboveground biomass modeling. The study area in the Piedmont physiographic region of Virginia is composed of temperate coniferous, deciduous, and ... Read more
Image fusion for enhanced forest structural assessment

Author: Roberts, JW ; Van Aardt, JAN ; Ahmed, FB Date: Jan 2011 This research explores the potential benefits of fusing active and passive medium resolution satellite-borne sensor data for forest structural assessment. Image fusion was applied as a means of retaining disparate data features relevant to ... Read more
Impact of communal land use and conservation on woody vegetation structure in the Lowveld savannas of South Africa

Author: Wessels, Konrad J ; Mathieu, Renaud SA ; Erasmus, BFN ; Asner, GP ; Smit, IPJ ; Van Aardt, JAN ; Main, Russell S ; Fisher, J ; Marais, W ; Kennedy-Bowdoin, T ; Knapp, DE ; Emerson, R ; Jacobson, J Date: Jan 2011 Millions of people rely on savannas for ecosystem services, such as the provision of grazing and fuel wood, so it is important to determine the extent to which utilization affects woody vegetation resources. Using airborne LiDAR from the ... Read more
Impact of communal land use and conservation on woody vegetation structure in the Lowveld savannas of South Africa – Lidar results

Author: Wessels, Konrad J ; Mathieu, Renaud SA ; Erasmus, BFN ; Asner, GP ; Smit, IPJ ; Van Aardt, JAN ; Main, Russell S ; Fisher, J Date: Apr 2011 People in the rural, communal areas of South Africa rely on live fuel wood for more than 90% of their energy requirements. Using airborne lidar from the Carnegie Airborne Observatory (CAO) the authors compared tree canopy cover and height ... Read more
Impacts of communal fuelwood extraction on lidar-estimated biomass patterns of savanna woodlands

Author: Wessels, Konrad J ; Erasmus, BFN ; Colgan, M ; Asner, GP ; Mathieu, Renaud SA ; Twine, W ; Van Aardt, JAN ; Smit, I Date: Jul 2012 Approximately 54% of rural households in South Africa continue to use wood as their main source of energy, mainly for cooking and heating. The provision of biomass by savanna woodlands is thus of considerable value to rural households and ... Read more
On using discrete return LIDAR distributions as a proxy for waveform LIDAR signals when modeling vegetation structure

Author: Van Aardt, JAN ; Wu, J ; McGlinchy, J ; Wessels, Konrad J ; Mathieu, Renaud SA ; Kennedy Bowdoin, T ; Knapp, DE ; Asner, GP Date: Jul 2012 The goals of the study were to (i) determine if there is a direct relationship between waveform LiDAR intensity-by-height and discrete return frequency-by-height (do the distributions match?) and (ii) assess the impact of scale (does this ... Read more
Unsustainable fuelwood extraction from South African savannas

Author: Wessels, Konrad J ; Colgan, MS ; Erasmus, BFN ; Asner, GP ; Twine, WC ; Mathieu, Renaud SA ; Van Aardt, JAN ; Fisher, JT ; Smit, IPJ Date: Jan 2013 Wood and charcoal supply the majority of sub-Saharan Africa’s rural energy needs. The long-term supply of fuelwood is in jeopardy given high consumption rates. Using airborne light detection and ranging (LiDAR), we mapped and investigated ... Read more
What lies beneath: detecting sub-canopy changes in savanna woodlands using a three-dimensional classification method

Author: Fisher, JT ; Witkowski, TF ; Erasmus, BFN ; Mograbi, PJ ; Asner, GP ; Van Aardt, JAN ; Wessels, Konrad J ; Mathieu, Renaud SA Date: Jul 2015 Question: Increasing population pressure, socio-economic development and associated natural resource use in savannas are resulting in large-scale land cover changes, which can be mapped using remote sensing. Is a three-dimensional (3D) woody ... Read more

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Browsing by Author "Van Aardt, JAN"

Browsing by Author "Van Aardt, JAN"

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All of ResearchSpace

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