Abstract
As an important living place for human beings, city is regarded as a main place for the birth, spread and development of human civilization. This paper, based on the principle of system development and combining with the need of building “Digital City”, makes an overall design of the “Digital City” 3D visualization system. Firstly, a 3D ground objects model, i.e. .x files, is made through inputting the ground objects of the experimental area into 3DSMAX, then, the .x files are converted to .xpc files in order to achieve a better displaying effect in producing a 3D landscape. Secondly, the author makes corresponding pre-processing to the aerial photos, satellite images, topographic data, digital elevation models and a variety of vector geographic data, and then superimposes and loads these data into Terra Builder module of Skyline software, which generates 3D topography landscape, that is, .MPT files and forms the terrain database required in Terra Explorer Pro software. Next, a 3D landscape is preliminarily established by inputting the 3D terrain model and the 3D ground objects model, i.e. .MPT files and .xpl files, in Terra Explorer Pro, and by editing a real and accurate 3D geographic model and a real Digital City 3D landscape model, that is, FLY files, are respectively formed. Finally, on the basis of the 3D landscape model, the system is developed by using Visual Basic + TerraDeveloper and the basic operation of 3D, spatial analysis, visible analysis and other basic functions are preliminarily achieved
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