文章基本信息

标题：Multi-Representation Geographic Data Organization Method Dedicated for Vector-Based WebGIS
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作者：Qian Xinlin ; Zhu Xinyan
期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2008
卷号：XXXVII Part B4
页码：815-818
出版社：Copernicus Publications
摘要：The paper proposed a Quadtree-based vector data structure which supports multi-representation of geographic data: Zoom Quadtree, it aims to meet the requirement of vector-based WebGIS in efficient retrieval of geographic vector data at different scales. According to the characteristics of map display in WebGIS that maps mostly rendered on the electronic display device, this paper introduced a concept of virtual screen, we divided vector data into tiles which use the size of regions of Quadtree-node as basic unit, and these tiles are fundamental data containers which were efficient and convenient in response to client's window query, and these tiles also are visible snapshot of geographic data in different scale which can be directly displayed in the virtual screen with decent density. The zoom quadtree structure assured that window block data with any scale can be obtained in limited number of Disk I/Os, after discussing and analysing existed multi-scale models and structures, we gave the principle and technique in create and maintain Zoom Quadtree. Issues like dynamic update of vector data and the possibility usage of these structures in VGI –integrated application are also discussed
关键词：Multi-Representation; Data Structure; Vector Data; Zoom Quadtree; Vector Pyramid; WebGIS; WFS