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Browsing by Author "Roberts, W"

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Long-term trends in vegetation phenology and productivity over Namaqualand using the GIMMS AVHRR NDVI3g data from 1982 to 2011

Author: Davis, CL ; Hoffman, MT ; Roberts, W Date: Jul 2017 Vegetation monitoring of arid and semi-arid environments using remotely sensed vegetation indices over long periods of time is essential to improve the understanding of the processes related to change. In this paper, 30 years of biweekly AVHRR ... Read more
Meteorologically estimated exposure but not distance predicts asthma symptoms in schoolchildren in the environs of a petrochemical refinery: a cross-sectional study

Author: White, N ; teWaterNaude, J ; Van der Walt, A ; Ravenscroft, G ; Roberts, W ; Ehrlich, R Date: Sep 2009 Community concern about asthma prompted an epidemiological study of children living near a petrochemical refinery in Cape Town, South Africa. Because of resource constraints and the complexity of refinery emissions, neither direct environmental ... Read more
Recent trends in the climate of Namaqualand, a megadiverse arid region of South Africa

Author: Davis, CL ; Hoffman, MT ; Roberts, W Date: Apr 2016 Namaqualand is especially vulnerable to future climate change impacts. Using a high-resolution (0.5°x0.5°) gridded data set (CRU TS 3.1) and individual weather station data, we demonstrated that temperatures as well as frequency of hot extremes ... Read more
Remote sensing based ecosystem state assessment in the Sandveld region, South Africa

Author: Lück-Vogel, Melanie ; O'Farrell, Patrick J ; Roberts, W Date: Dec 2012 We present a remote sensing based approach for assessing ecosystem state or intactness to inform land use management and conservation planning. Using segmented multispectral medium resolution satellite imagery, parameters related to the image ... Read more
Using remote sensing to inform integrated coastal zone management

Author: Roberts, W ; Lück-Vogel, Melanie Date: Jun 2010 Integrated coastal management (ICM) is a process for the management of the coast using an integrated approach, regarding all aspects of the coastal zone, including geographical and political boundaries, in an attempt to achieve sustainability. Read more

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Browsing by Author "Roberts, W"

Browsing by Author "Roberts, W"

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