Browsing by Author "Ogao, P.J."

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    Defining visualization operations for temporal cartographic animation design
    (International journal of applied earth observation and geoinformation, 2002) Ogao, P.J.; Kraak, M. J.
    Cartographic animation has emerged as a potentially effective visualization technique that has an intuitive power in representing dynamic geographical phenomena through its ability to show interrelations amongst geospatial data’s components, location, attribute and time. Whereas cartographic animation has prominently featured in communicating geospatial information, their use as tools for visual exploration has been hampered by lack of the necessary functionality that is capable of allowing users to interact with the dynamic display. In this paper, we outline an approach that defines visualizations operations or basic visual actions that implement a viewer’s task of exploration and characterization of geospatial structures in data or phenomena. The defined operations go along to reinforcing the quest in enabling users to perceive relationships and be able to manipulate geospatial data using more efficient visual tools while keeping low on cognitive demands.
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    A Spatial Decision Support Tool for Landfill Site Selection: Case For Municipal Solid Waste Management
    (Fountain Publishers, 2022) Nakakawa, Agnes; Ogao, P.J.
    One of the problems faced worldwide is waste management. It involves several activities, which can be categorized into: collection, transportation and disposal of waste. Computerizing the processes involved in these activities can help to improve efficiency and effectiveness in waste management. However, the process of particular interest and environmental concern is the effective selection of sites for waste disposal (landfill sites). The current process of selecting landfills in Uganda is manual, costly and time consuming. This paper presents the design and development of a Spatial Decision Support Tool as a computer-based technology that can be used to solve the complex process of landfill site selection for municipal solid waste management in Kampala and the neighboring Wakiso districts. Several parameters required in landfill site selection such as an area’s distance from: roads, rivers, lakes, wetlands, towns, gazetted land, and the soil type, topography, land cover of an area among others were considered. The tool was developed based on existing literature on landfill site selection, Spatial Decision Support Systems (SDSS), Geographical Information Systems (GIS) and Multi-Criteria Evaluation (MCE). The model used by the tool was designed using ArcView Spatial Analyst 2.0, the user interfaces were designed using Avenue Programming language and Visual Basic 6.0, and ArcView GIS 3.2a provided the Database Management System. The results of the tool were validated using Ground Truthing. The results of this study can be very helpful during the procurement process of landfill sites; that is, the concerned authorities can save time and costs associated with inspection and evaluation for bidders whose sites are located far outside the range of potentially identified areas.