Research On The Application Of Digital City In Urban Planning

With the rapid development of social and economic progress and the modern technology, the relationship between the development and the application of information technology and the urban construction and development becomes more and more closly, Kinds of urban planning support systems play an important role and have a great impact in the high-tech era of urban construction and management development. The use of the traditional two-dimensional space in urban planning and management has a lot of limitation. The standard is also uneven. Thus, the limitation of two-dimensional space technology in practical applications in urban planning and management is also outstanding.After the "digital city" concept proposed, the construction and application of Geographic Information Systems has made remarkable achievements. Recent years, the two-dimensional Geographic Information System have developed in many cities, three-dimensional urban development has become an inevitable trend. The level of Urban construction and management, to some extent, thanks to the three-dimensional urban construction. Nowadays, the trend of the construction of three-dimensional digital model becomes deeper and broader, such as the construction of large-scale model data, the construction of integrated business application and service. Besides, the requirements of the construction of three-dimensional digital model of the cities become more stringent. Through the research of the urban three-dimensional modeling techniques, makes the realistic city now in front of our eyes. The Digital City can provide three-dimensional geographic information services to government’s macro decision-making, planning and site selection, safety emergency, environmental protection an so on. The digital city can make social and economic benefits. The main contents of this article is strictly faithful to CAD data, information collected on the spot, remote sensing technology, geographic information system technology and3D modeling technology, combined with satellite images and aerial photographs to digital the plane, elevation, texture, color and other information of the image. After the final construction of the visualization of three-dimensional digital city. The city can be intuitively displaied in front of people, and it can provide comprehensive information support for the cities’ overall planning, design, decision support, transport facilities, which makes the urban planning and management more convenient and intuitive, it also can provide a basis for management decisions, provide help to the improvement of the efficiency of planning approval. After forming the three-dimensional digital city modeling. Then briefly introduces the application of digital city in urban planning, such as three-dimensional measurement, visibility analysis, analysis of sunshine, street facade analysis, viewshed analysis and other planning and decision support.