网格GIS数据信息发布的关键技术

网格GIS数据信息发布是通过网格计算环境发布存储在数据库中的信息,是实现网格GIS的关键技术之一。网格GIS数据信息发布的特点是其发布方法的通用性、高效性、高自主性、易实现性以及软件的复用性。在传统的WebGIS数据信息发布中,常用的CGI、API、JDBC、ASP、JSP等方法在实现网格GIS数据信息发布过程中均存在局限性。软件Agent技术以及中间件技术为解决网格GIS数据信息发布提供了新的技术保障,本文针对网格GIS数据信息发布的要求和特点,讨论了利用Agent和中间件来实现网格GIS数据信息发布,利用Agent的思路和方法对传统的方法封装成数据信息发布中间件,从而用来进行网格GIS数据信息发布。

Data Information Publishing in Grid-GIS

Data information publishing in Grid-GIS, one of the key technologies of Grid-GIS realization, is publishing the stored data information in GIS database with the means of Grid. It has such characters as all-purpose in realization, high-powered in publishing, easy-realization and publishing software reuse. Data information publishing in traditional WebGIS is realized by ways of CGI, API, JDBC, ASP, JSP etc. Any one of this methods has it's deficiency in publishing, such as it's heavily relying on the Web server makes Web server heavily laden, low intelligence, and difficulty to realize in heterogeneity database. Software Agent as an intelligent software, can continuously and independently work in the Web. Middleware is also a software which has such characters as standard communication protocol, distributed computing and transparent manipulation of Web, hardware, and software systems. So it can meet the need of highly computing and independence of hardware and operation system. Agent and Middleware provide basis for of the Grid-GIS realization. In this paper, the character of data information publishing in Grid-GIS was discussed. According to the characters of Grid-GIS, a new method, using the Agent and Middleware to realize the publishing of data information,was also discussed. In order to achieve this purpose the authors design such Agents as Login Manager agent, Grid-Web Interface agent, Messenger Agent, Task Manager Agent and Database Interface agent.