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SUPRESOFT developed total solutions to fulfill the requirement of 3D digital city model implementation. These include: remote sensing image processing, full digital photogrammetry systems for data generation, 3D GIS for 3D city model construction and visualization. The solution is shown in figure 6: VirtuoZo – flagship product of SUPRESOFT is a highly automatic and integrated spatial data processing system. It is able to perform aerial triangulation and generate DLG, DEM and DOM. It has the following features:  Fig.6 Supresoft’s total solution a. The advanced matching algorithms: bridge mode image matching and global image matching, utilizing a relaxation method. This allows a fast image matching of 1000 points/sec on a normal PC. b. Highly automatic process for image orientation, DEM extraction and DOM generation c. Able to handle high-resolution satellite data such as SPOT5, IKONOS, QUICKBIRD, etc, digital aerial photography such as DMC, VEXCEL, ADS40 etc, and close range photogrammetry data, which is well demonstrated in the reconstruction and modeling of the great Buddha statue in Bamiyan, Afghanistan. [Gruen et al., 2003] d. Support various format of Data, i.e. Soccet Set, Imagestation, Albany etc. And seamless embedded into microstation and Autocad. IMAGIS is 3D Visualization GIS developed by Supresoft Inc. It has the feature as follows: a. Support various common 2D/3D data exchange, easy to exchange data with other systems b. Provide powerful 3D entity modeling tools to create 3D model according to the requirements; c. Provide SQL Server, Oracle database interface, manage attribute data with them d. Provide building façade texture fast construction technology; reduce the amount of time and man effort in 3D city model set up. MagiXity - one of the modules of IMAGIS, is a professional 3D modeling and visualization system based for 3D digital model construction. The main functions are shown in figure 7.  Fig.7 The main functionalities of IMAGIS fro 3D digital model construction (Supresoft Inc., 2003) Developed by Supresoft, 3Dbrowser is an ideal system to realize 3D landscape creation and real time roaming for huge amount of image data on PCs. 3Dbrowser, one of the IMAGIS product module, is a powerful and flexible tool for real time roaming of huge amount of 3D landscape data. 3Dbrowser’s another key advantage is real time query of attributes in 3D roaming environment. Web3D, developed by Supresoft Inc., is a data browse platform based on web, in which the 3D scene can be shared and browsed via Internet, shown in figure 8. With the functions of these products, 3D digital city model can be set-up with acceptable man-effort and visualized in real-time on a normal PC. These products can also be widely applied in many application fields such as: fundamental surveying and mapping, urban planning, land resources management, military survey, satellite remote sensing, railroads, highways, irrigation works, electric power and other energy applications, environmental protection, agriculture, forestry, oceanography, telecom applications etc.  Fig.8 Data share model of Web3D 6. CONCLUSION The implementation of 3D digital city model is practicable with integrated technology of remote sensing image processing, digital photogrammetry systems, and 3D visualization GIS. It is demonstrated that the digital video camera provides an efficient way for building texture acquisition. And tune adjustment and mosaic technique is able to generate seamless building texture close to the reality. However, the automatic building boundary extraction technology is still not applicable, due to the low detection accuracy. Technologies for automatic building boundary extraction need further development in the future 3D digital city research to reduce the man-effort in building such models. 7. REFERENCES
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