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vector graph
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  vector graph
A model relating the input vector graph to the curves to be detected is proposed.
      
Hierarchical Image Segmentation-Part I: Detection of Regular Curves in a Vector Graph
      


The key to WebGIS technology is to issue the vector geography graph through the internet and provide the information service for the general browser end user. Considering the complexity, multiplicity and magnanimous space taking of the earthquake disaster evaluation information, the WebGIS based regional fast earthquake disaster evaluation system adopts a three layered network architecture, including the backstage database, the application server (map server) and the Web server, and the client composition. Different...

The key to WebGIS technology is to issue the vector geography graph through the internet and provide the information service for the general browser end user. Considering the complexity, multiplicity and magnanimous space taking of the earthquake disaster evaluation information, the WebGIS based regional fast earthquake disaster evaluation system adopts a three layered network architecture, including the backstage database, the application server (map server) and the Web server, and the client composition. Different from the traditional evaluation method as taking the building as the statistical unit, this fast evaluation system takes the city administrative area, the township or the town as the working unit. Using foundation database and other census data, we can determine the earthquake influence on a given target area according to the earthquake background analysis or the estimation of effect of a given earthquake in the future. By means of the relational model of population data and the earthquake losses, as well as combining the analysis result of earthquake resistance and seismic vulnerability, the possible damage to the target area can be predicted, and accordingly the economic losses and personnel casualty can be estimated.With the platform of ESRI Corporation's ArcIMS 4.1, and mainly the development of technology of VB+ArcObject server module, this system has realized the system core computation, the vector graph superimposition, the dynamic updating of the vector graph attribute data and the distribution graph, as well as the map issuing and the dynamic data management in the server end. The client side is designed with the use of ASP dynamic homepage and the databank administration techniques. The system consists of the function modules of foundation data management and maintenance, fast earthquake damage evaluation, reporting management and system assistance management, and etc. This system makes full use of the existing achievements in fast earthquake disaster evaluation as well as the census data of the Fujian Province, therefore possesses such merits as low investment, regular data updating and being easily accessible as well.

在进行大规模城乡震害预测工作中,需要使用与传统预测方式不同的新模型及新方法,以便实现震害快速预测及结果共享。利用人口普查数据等基础数据库,根据人口数据及灾害损失的关系模型,基于WebGIS技术,采用三层体系网络架构(由后台数据库、应用服务器(地图服务器)+Web服务器、客户端组成),利用VB+ArcObject服务器组件开发技术,通过动态链接库技术实现了在Ar-cIMS下的地图动态更新、动态预测及动态发布功能,实现了具有B/S结构的震害预测管理信息系统。该系统具有投入少、数据自动预测、定期更新且易于获取等优点,实现了地震震害信息共享。

 
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