摘要
作为在Internet上处理大容量空间地理信息的基于客户端的Internet地理信息系统 (client sideInter netGIS) ,解决矢量型空间数据传送的低效率性是很重要的。该文为此提出一个新的有效方法。首先 ,将大型矢量地图根据适当的“分裂度”分割成若干部分 ,每一部分称作一个“块”(Tile) ;然后 ,当用户在客户端请求地图的某一区域时 ,GIS服务器只传送和请求区域相交叠的“块”内的空间数据 ,并且将该数据存在用户的本地机上 ,以便再用。为此 ,该文提出一个“地图块分割”方法 ,“地图块查询处理”算法以及“客户服务器间空间数据的效率化传送”策略。和既存传送方法比较 ,利用该方法构造的InternetGIS 。
It is important to solve the low performance of spatial vector data transmission in the client side Intermet GIS (Geographic Information System) which handles large size spatial geographic information on the Internet. This paper has proposed a new efficient method for it. The basic idea is that, firstly, a large size vector map is divided into several parts, where each part is called a ‘Tile’, according to an appropriate division granularity. Secondly, when an user requires a certain region in the map at client side, the GIS server only transmits spatial data in the tiles which overlap with the requested region. And the received data are stored in client local machine for reuse. For the support of this idea, a method of tile division, an algorithm for tile query processing and a strategy for efficient spatial data transmission between server side and client side have been provided. Comparing with the traditional methods of client side Internet GIS, the performance improvement is achieved by the usage of the proposed method.
出处
《遥感学报》
EI
CSCD
北大核心
2001年第4期267-276,共10页
NATIONAL REMOTE SENSING BULLETIN
基金
韩国情报通信部"大学软件研究中心支援基金"
