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Pattern preserving method for grid simplification in road networks

Yang Bisheng,Zhang Yunfei,Luan Xuechen 1.State Key Laboratory for Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China; 2.Engineering Research Center for Spatio-temporal Data Smart Acquisition and Application,Wuhan University,Wuhan 430079,China  
In this paper we propose a grid simplifying method for road networks which preserves the structural patterns.The proposed approach firstly identifies the grid structure,and then merges grids contained by other grids and aggregates these grids into clusters according to their connectivity.The proposed method simplifies grids according to the principle of information minimum loss that is characterized by the grid index,the principal direction,and the elongation index.Two road datasets of Zurich and Wuhan were selected to evaluate the validity of the proposed method.Experimental results show that this method well preserves grid-like pattern.The simplified results provide a good data source for visualizations on small screen devices,multiple representation,and progressive transmission.
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