Framework of 3D Urban Geophysical Data Management and Service System

In order to support the data requirement for city development, this paper presents methods to build a framework for 3D urban geophysical data management and service system (3D UGDMSS), including database and information management, integrated processing and display of multi-methods, 3D visualization of interpretation data and production broadcasting. The database and information management is the base of the system, and offers all data for other levels. The second level based on 2D GIS exists as a tool for data display and interaction for multi-methods integrative processing, and establishes a foundation for production. Levels three and four carry on the work of displaying the production information from urban geophysical data. The third level is 3D visualization of the information, and the fourth promulgates the production through the internet. There are two challenges when building the 3D UGDMSS. Managing urban geophysical data from different methods synthetically is the first. In this paper, we suggest the database is formed in different layers, subjects and elements, in which the data are concretized with geophysical survey points and lines. The second challenge comes from information visualization in 3D space. The production information from urban geophysical data is transferred into geological forms shown in 3D space. A hybrid data structure model based on wire frame model designed to describe this data and the 3D modelling process is introduced. This system framework has been successfully applied in one city of North China.