http://hdl.handle.net/10628/84 2013-05-20T13:42:32Z 2013-05-20T13:42:32Z Nangolo, Esther N. http://hdl.handle.net/10628/315 2012-04-03T00:00:04Z 2011-01-01T00:00:00Z

Title: Balancing the technical and social contexts of Spatial Data Infrastructure (SDI). Authors: Nangolo, Esther N. Abstract: One special characteristic of spatial data is that they can be shared to be used for many purposes other than the one for which they were initially produced. To facilitate their efficient sharing and reuse, they need to be properly managed in the form of a Spatial Data Infrastructure (SDI). This study argues that developing a successful SDI must be seen as a socio-technical, rather than a purely technical exercise. It urges that SDI practitioners need to understand the significance of human and societal issues as much as technical issues, all of which contribute to the successful implementation of SDI.

2011-01-01T00:00:00Z De Cauwer, Vera http://hdl.handle.net/10628/217 2011-03-14T07:55:25Z 2007-01-01T00:00:00Z

Title: Mapping of the BCLME shoreline, shallow water & marine habitats: Physical mapping project. Authors: De Cauwer, Vera Description: Project in collaboration with the Benguela Environment Fisheries Interaction & Training Programme (BENEFIT) for the Benguela current Large MArine Ecosystem (BCLME) Programme.

2007-01-01T00:00:00Z Ruddick, Kevin De Cauwer, Vera Park, Young-Je Moore, Gerald http://hdl.handle.net/10628/216 2011-03-04T13:23:46Z 2006-01-01T00:00:00Z

Title: Seaborne measurements of near infrared water-leaving reflectance: The similarity spectrum for turbid waters. Authors: Ruddick, Kevin; De Cauwer, Vera; Park, Young-Je; Moore, Gerald Abstract: Theory and seaborne measurements are presented for the near infrared (NIR: 700–900 nm) water-leaving reflectance in turbid waters. According to theory, the shape of the NIR spectrum is determined largely by pure water absorption and is thus almost invariant. A ‘‘similarity’’ NIR reflectance spectrum is defined by normalization at 780 nm. This spectrum is calculated from seaborne reflectance measurements and is compared with that derived from laboratory water absorption measurements. Factors influencing the shape of the similarity spectrum are analyzed theoretically and by radiative transfer simulations. These simulations show that the similarity spectrum is valid for waters ranging from moderately turbid (e.g., water-leaving reflectance at 780 nm of order 1024 or total suspended matter concentration of order 0.3 g m23) to extremely turbid (e.g., reflectance at 780 nm of order 1021 or total suspended matter of order 200 g m23). Measurement uncertainties are analyzed, and the air-sea interface correction is shown to be critical for low reflectances. Applications of the NIR similarity spectrum to atmospheric correction of ocean color data and to the quality control of seaborne, airborne, and spaceborne reflectance measurements in turbid waters are outlined.

2006-01-01T00:00:00Z De Cauwer, Vera http://hdl.handle.net/10628/86 2011-03-02T08:52:37Z 2006-01-01T00:00:00Z

Title: Assessing potential to produce final ocean colour maps of Namibia`s marine environment: Final report for BCLME/UNOPS PCU/POLYTECH/05/01 MODIS. Authors: De Cauwer, Vera

2006-01-01T00:00:00Z