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Browsing by Subject "Desertification"

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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
CSIR ScienceScope: S&T for global impact

Author: CSIR Date: Mar 2009 'S&T for global impact', the theme of this ScienceScope, features a selection of multidisciplinary projects with collaborators outside South Africa's borders from as near-by as Namibia to as far away as Russia and the Caribbean. CSIR's work ... Read more
Desertification in the Sahel: a reinterpretation of a reinterpretation

Author: Prince, SD ; Wessels, Konrad J ; Tucker, CJ ; Nicholson, SE Date: Jul 2007 In semiarid regions the ratio of annual net primary production to precipitation, rain-use efficiency (RUE), has been used as an index of desertification. In a recent publication (Hein & de Ridder, 2006) it was proposed that an incorrect ... Read more
Land

Author: Audouin, Michelle A Date: Jan 2007 Unsustainable agricultural practices have had a role to play in the degradation of land on which agriculture depends. South Africa has an international obligation to develop a National Action Programme (NAP), the purpose of which is to identify ... Read more
Limits to detectability of land degradation by trend analysis of vegetation index data

Author: Wessels, Konrad J ; Van den Bergh, F ; Scholes, RJ Date: Oct 2012 This paper demonstrates a simulation approach for testing the sensitivity of linear and non-parametric trend analysis methods applied to remotely sensed vegetation index data for the detection of land degradation. The intensity, rate and ... Read more
Monitoring land degradation with long-term satellite data

Author: Wessels, Konrad J Date: 2011 In South Africa, land degradation in rangelands has been regarded as a major environmental problem for many years. During the last ten years, attention focussed on the land degradation in the former homelands, now communal lands. There is an ... Read more
Monitoring land degradation with long-term satellite data in South Africa.

Author: Wessels, Konrad J ; Prince, S Date: 2007 Desertification is defined by the United Nations Convention to Combat Desertification (UNCCD) as ‘land degradation in arid, semi-arid and dry sub-humid areas (dry-lands) resulting from various factors, including climatic variations and human ... Read more

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Browsing by Subject "Desertification"

Browsing by Subject "Desertification"

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