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This paper presents a generalization algorithm focusing specifically on urban street networks. A street map that uses outlines of blocks to implicitly delineate the shape of streets is essentially a complex polygon with holes in computer graphics. Given such a street map, this algorithm first applies medial axis transformation to derive a rudimentary skeleton of the street network. Because the resulting...
We propose a navigation model for indoor environments that combines a 3D geometric modeling of buildings with connection properties of spaces and semantic elements such as openings and installations. The model is an extension of the IndoorGML standard navigation module with a twofold benefit: the extension facilitated the data import from the international standard CityGML and introduced the semantics...
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