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- W2185381566 abstract "The creation of large-scale digital topographic databases of urban areas provides, in theory, a rich source of basic data that could be used in a variety of applications. Urban planners and engineers can use such data for both analytical and management oriented applications. In the developing world, Geographic Information Technology (GIT) is increasingly accessible to mapping agencies and local government agencies, opening possibilities to improve the supply of data for GIT applications in urban management. The paper describes the application of topographic data for two main applications: the generation of a DEM covering the city of Dar es Salaam and the study of housing density in the city with a particular emphasis on unplanned areas. In the development of both applications considerable difficulties related to data quality have been confronted. Several kinds of errors, most of which stem from the data capture process, are described. Many are not systematic and the variation over the database area ranges between 2% and 30% of affected features for a particular problem. Several strategies have been developed in order to isolate and correct for some of these problems many of which could have been isolated with improved quality control procedures. Ultimately, a DEM and some useful statistics and maps of housing density have been produced. The reactions to these outputs by local planners and engineers indicate that there is indeed rich potential in such data. However, in order to tap this potential effectively, usability should be considered as a basis for spatial data acquisition." @default.
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- W2185381566 date "2000-01-01" @default.
- W2185381566 modified "2023-09-22" @default.
- W2185381566 title "Usability of large scale topographic data for urban planning and engineering applications : examples of housing studies and DEM generation in Tanzania" @default.
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