基于WebGIS的空间过滤组件研究

Study on Space Filtering Component Based on WebGIS

目前使用的GNetViewer9.0平台不提供Web上的自定义区域空间过滤功能,使得对指定区域内的信息查询十分困难。为此,在GIS基础功能的基础上,提出基于VML技术在客户端动态绘制自定义区域,通过有向边加权,基于数据库存储过程求解交点个数,快速检测出区域内信息,并使用组件技术进行封装。实践证明,该组件查询速度快、准确性高。

As the currently used GNetViewer9.0 platform does not provide custom-area space filtering function on the Web, enabling the accurate information within the designated area is very difficult to query. Based on the basic function of GIS, this paper proposes a new method of dynamic drawing custom-area in the client-side based on VML technology, through a directed edge-weighted, to solve the intersection number based on database stored procedure, quickly to detect the accurate information within the designated area. Practice shows the fast component query speed and high accuracy.