Abstract
One of the most important developments in GIS technology is the ability to extend two-dimensional analytical functionality into the third dimension. The approach of modeling objects for three-dimensional (3D) descriptions of the real world has been very useful for some urban applications such as planning, construction, management and representation of the urban sceneries. 3D city model is basically a computerized model or digital model of a city. Normally 3D city model delivers a true picture and real scene of the ground and enable the planners to view the locations of services and real places in an intuitive and use-friendly way. And there are many useful applications of 3D city model in urban planning analysis, noise propagation simulations and flood simulations. Nowadays, 3D city models play a more and more important role in GIS.
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