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Browsing by Subject "NDVI"

Now showing items 1-15 of 15

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 leaf spectral properties of Phragmites australis impacted by acid mine drainage

Author: Van Deventer, Heidi ; Cho, Moses A Date: Jul 2014 The decanting of acid mine drainage (AMD) from the Western Basin on the Witwatersrand in late 2010 raised concerns about AMD risks in other gold, coal and copper mining areas of South Africa. Field spectroscopy and the use of vegetation indices ... Read more
Assessing the effects of human-induced land degradation in the former homelands of northern South Africa with a 1 km AVHRR NDVI time-series

Author: Wessels, Konrad J ; Prince, SD ; Frost, PE ; Van Zyl, D Date: 15 May 2004 There is a pressing need for an objective, repeatable, systematic and spatially explicit measure of land degradation. In northeastern South Africa, there are large areas of the former homelands that are widely regarded as degraded. A time-series ... Read more
Can human-induced land degradation be distinguished from the effects of rainfall variability? A case study in South Africa

Author: Wessels, Konrad J ; Prince, SD ; Malherbe, Johan ; Small, J ; Frost, PE ; Van Zyl, D Date: Jan 2007 Advanced Very High Resolution Radiometer (AVHRR), Normalized Difference Vegetation Index data (NDVI, I km (2), 1985-2003) and modelled net primary production (NPP, 8 km (2), 1981-2000) data were used to estimate vegetation production in South ... Read more
Can linear trend analyses of NDVI time series data truly detect land degradation? Simulations may provide the answer

Author: Wessels, Konrad J ; Van den Bergh, F ; Scholes, RJ ; Miteffa, S Date: Apr 2011 There has been a recent proliferation of remote sensing-based trend analysis for monitoring regional desertification. These show contradictory results. All of them claim to have been “validated” through expert interpretation, in the absence ... Read more
Change detection of bare areas in the Xolobeni region, South Africa using Landsat NDVI

Author: Singh, RG ; Engelbrecht, Jeanine ; Kemp, J Date: Jun 2015 Identification and protection of areas that are vulnerable to erosion is essential for the conservation of the sensitive wetlands and estuarine ecosystems along the Xolobeni coastal strip. The forecasting of these erosion susceptible areas ... 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
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
Impacts of Land Use Land Cover Change on Land Degradation: Case of the Greater Sekhukhune District

Author: Kgaphola, Motsoko J ; Ramoelo, A ; Odindi, J ; Mwenge Kahinda, Jean-Marc ; Seetal, Ashwin R Date: Oct 2021 Interaction between biophysical variables and socioeconomic conditions are far more complex and affect land cover and quality. These are aggravated by global climate change and climate variability in semi-arid regions. Therefore, the study ... Read more
Improving NDVI time series class separation using an extended Kalman filter

Author: Kleynhans, W ; Olivier, JC ; Salmon, BP ; Wessels, Konrad J ; Van den Bergh, F Date: Jul 2009 It is proposed that the NDVI time series derived from MODIS multitemporal remote sensing data can be modelled as a triply (mean, phase and amplitude) modulated cosine function. A non-linear Extended Kalman Filter was developed to estimate the ... Read more
Influence of using date-specific values when extracting phenological metrics from 8-day composite NDVI data

Author: Bachoo, A ; Archibald, S Date: Jul 2007 Information of vegetation dynamics derived from remotely sensed data is essential for regional natural resource management. A common approach involves using an n-day composite time-series of normalized difference vegetation index (NDVI) ... Read more
Relationship between herbaceous biomass and 1km (2) advanced very high resolution radiometer (AVHRR) NDVI in Kruger National Park, South Africa

Author: Wessels, Konrad J ; Prince, SD ; Zambatis, N ; Macfadyen, S ; Frost, PE ; Van Zyl, D Date: Mar 2006 The relationship between multi-year (1989-2003), herbaceous biomass and 1-km(2) Advanced Very High Resolution Radiometer (AVHRR) Normalized Difference Vegetation Index (NDVI) data in Kruger National Park (KNP), South Africa is considered. The ... Read more
Relevance of rangeland degradation in semiarid Northeastern South Africa to the nonequilibrium theory

Author: Wessels, Konrad J ; Prince, SD ; Carroll, M ; Malherbe, Johan Date: Apr 2007 According to the nonequilibrium theory, livestock grazing has a limited effect on long-term vegetation productivity of semiarid rangelands, which is largely determined by rainfall. The communal lands in northeastern South Africa contain ... Read more
Remote sensing of species diversity using Landsat 8 spectral variables

Author: Madonsela, Sabelo ; Cho, Moses A ; Ramoelo, Abel ; Mutanga, O Date: Nov 2017 The application of remote sensing in biodiversity estimation has largely relied on the Normalized Difference Vegetation Index (NDVI). The NDVI exploits spectral information from red and near infrared bands of Landsat images and it does not ... 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

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Browsing by Subject "NDVI"

Browsing by Subject "NDVI"

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