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提出一种保持格网几何模式的城市路网简化方法。该方法首先在格网自动识别的基础上对格网间的空间关系进行计算,将存在包含关系的格网合并成更高等级的格网;然后对格网进行连通划分,以格网指数、主方向、延展指数作为格网信息分量进行搜索,删除使格网信息量损失最小的路段,实现格网的简化;最后,以武汉与苏黎世城市路网数据作为实验数据进行格网简化。实验结果表明,本文方法在简化格网的同时能够较好地保持格网的模式特征,为小屏幕地图可视化、空间数据多尺度表达和渐进传输等提供较好的数据源。
A simplified method of urban road network is proposed to maintain the grid geometric pattern. The method first calculates the spatial relationship between grids based on the automatic grid identification, and then merges the existing grids into higher grids. Then, the grids are divided into two parts: grid index, Main direction, and extension index as the grid information components, delete the sections which minimize the loss of the amount of grid information, and simplify the grid. Finally, using the urban road network data of Wuhan and Zurich as the experimental data to simplify the grid. The experimental results show that the proposed method can keep the grid pattern well while simplifying the grid and provide a good data source for the visualization of the small screen map, multi-scale spatial data representation and progressive transmission.