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针对利用专业GIS工具开发WebGIS应用系统的缺点,提出了从底层开发WebGIS平台的思路。以J2EE为技术规范,采用三层客户/服务器体系结构,设计了WebGIS平台体系框架。根据面向对象的思想,设计了GIS功能模块的对象模型。基于Servelet动态图片生成技术,通过将矢量图形转化为图像,构造了高效的地图生成引擎。利用Ajax技术提交交互请求,实现了地图的高效交互浏览。在三峡库区滑坡稳定性评价系统中的应用表明,提出的方法是可行的,开发的WebGIS平台具有小巧灵活、运行速度快、对系统软硬件要求低的优点,具有较强的实用价值。
Aiming at the shortcoming of developing WebGIS application system by using professional GIS tools, the idea of developing WebGIS platform from the ground up is put forward. J2EE as the technical specification, using three-tier client / server architecture, designed WebGIS platform architecture. According to the object-oriented idea, the object model of GIS function module is designed. Based on Servelet dynamic image generation technology, an efficient map generation engine is constructed by converting vector graphics into images. The use of Ajax technology to submit interactive requests, to achieve an efficient interactive browsing map. The application of the landslide stability evaluation system in the Three Gorges reservoir area shows that the proposed method is feasible. The developed WebGIS platform has the advantages of compactness and flexibility, fast running speed and low requirements on hardware and software of the system, and has strong practical value.