%0 Journal Article
%T A Spatial Index to Improve the Response Speed of WebGIS Servers<br>一种加快WebGIS服务器响应速度的空间索引
%A YE Chang-Chun
%A LUO Jin-Ping
%A ZHOU Xing-Ming
%A <br>叶常春
%A 罗金平
%A 周兴铭
%J 软件学报
%D 2005
%I 
%X WebGIS servers send digital maps to users. For each request-response round, the servers access map data in batches. The access has a feature called multiscale, that is, the map scales selected by users determine the map detail levels. The access method based on R-tree is not adaptive to the multiscale and batch feature. It has two problems: (1) the data records of features of the same level are not clustered in disks; (2) the granularity of data I/O is too small. So accessing map data for display is unefficient. This paper presents a novel spatial index called Multilevel R-tree, which can solve the two problems. The statistics from experiments show that for range queries, the access method based on multilevel R-tree is much more efficient than the one based on R-tree and can improve the response speed of WebGIS Servers.
%K WebGIS service
%K spatial database
%K access method
%K spatial index
%K multilevel R-tree<br>WebGIS服务
%K 空间数据库
%K 访问方法
%K 空间索引
%K 多级R-tree
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=7735F413D429542E610B3D6AC0D5EC59&aid=1F4C44A303C4E55A&yid=2DD7160C83D0ACED&vid=7801E6FC5AE9020C&iid=94C357A881DFC066&sid=C79A3F06E2AC5B9E&eid=4C69616AE50D2DDC&journal_id=1000-9825&journal_name=软件学报&referenced_num=5&reference_num=10