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GeoJournal - Slum development has become a major urban planning and management problem due to the challenges they pose to the larger urban environment. Activities of slum dwellers are...  相似文献   
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The 3D Elevation Program (3DEP) is a collaborative effort among government entities, academia, and the private sector to collect high-resolution 3-dimensional data over the United States. The United States Geological Survey (USGS) is making preparations for managing, processing, and delivering petabytes of 3DEP elevation products for the Nation. In addition to the existing 1/3, 1, and 2 arc-second seamless elevation data layers of The National Map, new 3DEP products include lidar point cloud data; a standard 1-meter DEM layer; additional source datasets; and, in Alaska, 5-meter digital elevation models. A new product generation system improves the construction and publication of the seamless elevation datasets, prepares the additional 3DEP products for distribution, and automates the data management functions required to accommodate the high-volume 3DEP data collection. Major changes in geospatial data acquisition, such as high resolution lidar data, volunteered geographic information, data processing using parallel and grid computer systems, and user needs for semantic access to geospatial data and products, are driving USGS research associated with the 3DEP. To address the research requirements, a set of inter-related projects including spatiotemporal data models, data integration, geospatial semantics and ontology, high performance computing, multi-scale representation, and hydrological modeling using lidar and other 3DEP data has been developed.  相似文献   
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Intensive suburbanization, especially in postsocialist countries, and a deficiency of fully public spaces result in an increasingly complex mixture of different types of spaces of public functions. Where there is a deficiency of completely public spaces, their role can be enhanced by those places available to the public for a specified period of time and under certain circumstances. Such places are provided and maintained not only by the public but also by the private sector. This article explores the diversity of places of public character and looks for criteria that organize this diversity. It introduces a new typology that corresponds mainly to the suburbs and combines five criteria of categorization: intended users, time limits as to access, prevailing form of control, intended functions, and visual characteristics. The typology draws attention to the role of spaces not intended for all the public but for selected groups and that of spaces with time-limited access. Such semipublic places are consistent with the lifestyle of suburbanites and therefore play an increasingly important role in suburban social life.  相似文献   
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This article aims to determine how three factors—the fence, the internal public space, and the type of building—affect the sense of community, as well as the perception of social divisions that gated communities generate and the need for integration between people living in and outside gated communities. Its results are based on the survey conducted in two villages, Józefos?aw and Julianów, located in the Warsaw metropolitan region. It has been found that the existence of a physical barrier in the form of a fence affects the perception of human relationships. Research has confirmed the negative impact of fencing off on social bonds, the sense of community, and attachment to the area beyond the housing estate. The study of Józefos?aw and Julianów, however, has proved that for the residents of suburban gated communities the key factor that can increase their sense of community is access to an internal public space. The sense of community and the attachment to the area of residence are also dependent on the type of building. Inhabitants of suburban gated communities dominated by multifamily housing are definitely characterized by a weaker attachment.  相似文献   
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