Browsing by Subject "geographical information systems"

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    Development of a geographical information system based transport assessment approach in rural South Africa - The Case of Healthcare Accessibility in Cape Winelands District Municipality
    (2019) Ma-Kiese, Stephane Simon Masamba; Vanderschuren, Marianne
    For communities in urban and rural areas, access to healthcare facilities is a very significant concern of service delivery to both public policy makers and urban planners. Many healthcare systems set one of their primary objectives to achieve equity and ease of access to healthcare facilities for the populations that they serve. Spatial distribution of population, transport infrastructure, as well as spatial distribution of healthcare facilities are key characteristics that influence the disparities in spatial accessibility to healthcare facilities. Regardless of the permanent interest in transport accessibility, it is often uncertain how different types of accessibility measures relate to one another and which conditions are best for applications. In general, the current study undertakes a statistical comparison among three spatial accessibility measures (representing the main categories of spatial accessibility models) to determine whether they are comparable and/or interchangeable. Specifically, this study aims to use a geographical information system based approach combined with spatial accessibility measures, in a case study, derived from fine spatial resolution datasets, to characterise and divulge spatial variations in individual’s access to healthcare facilities and identify deprived locations/local communities in a selected District Municipality of the Western Cape, South Africa. Results indicate that the main categories of spatial accessibility measures provide different interpretations of accessibility that cannot be reproduced by each other. However, the accessibility measures show a significant similar trend in variations of individual’s accessibility to healthcare services for the communities of Cape Winelands District Municipality. The study establishes that within the Cape Winelands there exist spatial variations in the distribution of accessibility to healthcare and characterises these variations.
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    Open Access
    The Oosterland GIS : applying aspects of geographical information systems to maritime archaeological project
    (1998) Sharfman, Jonathan; Werz, Bruno
    The ancestors of Geographical Information Systems (GIS) were first developed in the early 1960's as a computer mapping mechanism but with the development of the Canada Geographical Information System the base was set for a powerful spatial analytical tool that could be used in a wide range of applications from business through to map analysis and archaeology. GIS have been used in terrestrial archaeology with success for a number of years and have started to move into the maritime archaeological field, however, little has been published on the use of GIS in the regard to the latter. On 24 May 1697, the VOC retourschip, Oosterland, was wrecked in Table Bay off Paarden Eiland, Cape Town, South Africa. With its discovery by sport divers in 1988, an ideal opportunity represented itself for the first scientific excavation of a shipwreck in southern Africa. With the development of the project, it was decided that GIS would be applied to surveyed artefacts recovered over the first fieldwork seasons. Early efforts, in 1991 and 1994, set up a GIS for this site that succeeded in plotting and mapping artefact groups selected by the user but failed in creating a system through which advanced spatial analysis could be undertaken. Because of the simplicity of the 1991 and 1994 versions of the Oosterland GIS and the fact that the format of analysis was changed from the ARCJINFO to ArcView GIS, it was necessary to re-enter all of the data. This was achieved by creating tables in the Tables feature of ArcView that contained x and y positions for all of the surveyed artefacts. Positioning of artefacts was achieved through a True Basic program that converted on-site tape measurements into map co-ordinates. Other features included in these tables were artefact numbers, names, a classification and a description of each artefact created specifically for use in this system. Once data had been captured it was plotted and spatial analysis that hoped to test the viability and accuracy of the system was performed. These tests included the orientation of the wreck on the sea floor, and assigning ownership of personal trade items within the artefact assemblage to specific people or areas on board the ship. Tests also examined the position of artefacts whose place on the working vessel were known from historical documentation and related them to other artefacts present in their immediate neighbourhoods. This system appears to possess the potential for being a powerful analytical tool which can be easily updated to include more advanced analysis and adapted to incorporate other wreck sites. Finally, this system has enormous potential as an educational tool that can be used to raise awareness of the importance of historically significant wrecks.