三维城市地球物理数据管理与服务系统框架

为实现地球物理数据对城市发展提供数据支持,以3D GIS作为基础平台,从数据与信息管理、多方法综合处理与显示、成果的三维可视化表达及信息发布等4个层次阐述了三维城市地球物理数据管理与服务系统框架的构建;数据与信息管理子系统是整个系统的基础,提供数据基础.GIS支持下的第2层次作为数据显示和多方法交互综合处理的工具而存在,并为成果信息表达提供基础.后2个层次实现城市地球物理成果数据的展示功能.第3个层次是对成果数据的三维再现,而第4个层次则通过Web来发布成果信息.在构建三维城市地球物理数据管理与服务信息系统时,存在2个方面需要解决的问题:(1)要实现多期次海量的城市地球物理数据的一体化管理问题.提出了以地球物理勘探点、线作为多方法数据融合的基础,分层次、专题按要素的方式建立多维数据库,以达到对数据的统一管理.(2)成果信息的可视化问题.为了在三维空间中再现成果数据,将地球物理形式的数据转换成地质形式,设计了一个以线框模型为基本思想来表达三维地质模型的数据模型.将提出的系统框架结合华北某地区进行了应用,取得了较好的效果.

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.