Design And Realization Of City Three-dimensional Geographic Information System Based On Skyline

City is the center of socio-economic,80%of Gross Domestic Product (GDP) isconcentrated in city，China put forward the initiative of rural urbanization in recent years,urbanization has become a big trend of social development, the city’s position has becomeincreasingly prominent in our society. Today the city is not only a human gathering place butan organic whole, so we have to use technology to change the city, in this case, thethree-dimensional geographic information system came into being as the Means of realizationof the digital cities. In recent years, the digital city is becoming the focus of attention, whilethe city’s three-dimensional geographic information systems as an important component of theDigital City, has become the focus of the work of the surveying and mapping.I built Chaoyang New District Three-dimensional geographic information systems fromthe theory of the Digital City, this system can provide users with different uses ofthree-dimensional geographic information services, and provide urban managementdepartment with the urban development in this stage as a reference, and providedecision-making for the city planning and management department; I built Chaoyang NewDistrict geospatial database, users can query the attribute data of each unit conveniently; Italso can provide users with comprehensive geographic information services, includingbrowsing the urban landscape, various three-dimensional analysis, query the information youneed.In this paper I determine the technology and methods of geographic informationsystems,from the perspective of building the city’s three-dimensional Geographic InformationSystem and in accordance with the principles of geographic information systems development,based on aerial photos、digital elevation models and relief map, I establish the Chaoyang NewDistrict Three-dimensional scene, in this paper I use C#.NET programming language and thedevelopment platform three-dimensional geographic component TerraDeveloper skylinesoftware provides, the system is mainly to achieve three-dimensional basic operations, information query, spatial analysis and3D roaming and other functions.