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《Geography and Geo-Information Science》 2010-01
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Research on the Hybrid Index Structure for Aggregated Spatial Data

ZHOU Tong1,LONG Yi2,TANG Guo-an2,HU Lei-di2(1.School of Geographic Science,Nantong University,Nantong 226007;2.Key Laboratory of Virtual Geographical Environment,Ministry of Education,Nanjing Normal University,Nanjing 210046,China)  
Studies on spatial data distribution and index structure have found that neither grid nor quadtree index structure is efficient for managing the aggregated spatial data.In case of the grid index structure,either the majority of the data is located in very few grids or too detailed carving-up will lead to many grids,thus resulting in data redundancy.The only employment of quadtree index structure is also unsatisfactory since data concentration will lead to the quadtree depth increase,thus undermining index efficiency.Based on the advantages of the aforementioned two structures,a spatial hybrid index structure is proposed in this paper,which adopts the grid index structure for the larger scale and then complements it by inserting quadtree index structure into it per parameters requirement.After a preliminary analysis of its efficiency,details are given about how to construct such a hybrid index structure and to control its parameters.Within the experiment of this paper,the grid index structure adopts a coding strategy with redundant data,with linear top-down quadtree index structure inserted.The two main parameters of the hybrid index structure are the resolution and the quadtree threshold respectively,with the former determining the number of quadtrees and the latter meaning the threshold number of geographical objects in a quadrant,when the quadtree will stop carving up.Both the grid resolution and the quadtree threshold shall be set in line with the distributing feature of geographical spatial data.The hybrid index structure is applied to visualizing the spatial data of Nanjing City obtained from portable navigating devices.The research result shows that the hybrid index structure enjoys obvious efficiency superiority over singular ones.Then it is concludes with recommendations for further study on inner mechanism of the hybrid structure,so as to enhance its stability and spread its application.
【Fund】: 国家863计划项目(2007AA12Z218);; 国家自然科学基金(40571120);; 南通大学自然基金(07z114)
【CateGory Index】: P208
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