关键词: WebGIS, B/S结构, 震害评估, 动态更新

Abstract: 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.

Key words: WebGIS, B/S structure, fast evaluation of earthquake losses, dynamical updating