基于AJAX的协同地图制图模型研究

Cooperative Web Mapping model based on AJAX

在整合AJAX技术、计算机协同工作技术与地理信息地图表达模型的基础上,提出了基于AJAX的协同地图制图模型。该模型采用AJAX技术的DOM、XML、XSLT及JavaScript描述地图表达的数据及其处理过程;以AJAX技术的B/S模式构建地图表达模型;以AJAX技术的XM-LHttpRequest属性和方法以异步方式更新Web地图;采用CSCW服务器端的通讯方式实现多用户之间动态MapMML数据的流动、交互与协作。最后在原型系统中分析了协同地图制图的主要环节。

Ajax, which stands for Asynchronous JavaScript and XML, is transforming the Web and fnternet-based applications forever. This paper suggests a new cooperative Web Mapping model based on AJAX, which integrates the AJAX technique, Computer Supported Cooperative Work and based XML cartographic representation model. First- ly, the new model uses these open standards DOM, XML, XSLT and JavaScript which AJAX builds on, in order to describe data and its procession of the model. Secondly, the model uses a new user interaction structure which is provided by Ajax, in order to improve the end user experience for web based applications. Thirdly, the model uses XMLHttpRequest API of Ajax, in order to update Web Map in the incremental way. Finally, a server centered communication approach is applied to the cooperative web mapping model based on AJAX, in order to implement dynamic MapMML data flow, interaction and cooperation among different users.