基于Hilbert R-树的城市街道空间布局模型仿真

Simulation of Urban Street Spatial Layout Model Based on Hilbert R-Tree

以缓解城市交通压力为目的,对街道设施做适度整合,并结合"绿色活力街区"理念,提出基于Hilbert R-树设计了城市街道空间布局模型。在采集全部数据的Hilbert值的基础上,对所有节点按照构建时间的先后顺序展开排列,改进R-树。然后引入聚类思想,减少Hilbert R-树叶节点的面积,避免数据交叠。根据评价函数得分情况划分聚类数量,将MBR作为中心,以新生节点为聚类目标,完成街道空间数据索引。综合分析空间信息,计算交通流量、速度与密度三个要素,再通过划分街道类型建立等级矩阵,分别规划建筑前区、行人通行带、自行车、机动车等街道布局情况,从而构建完整的空间布局模型。仿真结果表明,上述模型能够满足布局指标的需求,实现街道空间合理布局。

Based on the concept of"green vitality block",this paper proposed an urban street space layout model based on Hilbert R-tree for alleviating the urban traffic pressure and integrating the street facilities appropriately.According to the Hilbert value of all the collected data,all the nodes were arranged in the order of construction time to improve the R-tree.The idea of clustering was introduced to reduce the area of Hilbert R-leaf nodes and avoid data overlapping.The number of clusters was divided by the evaluation of the function score.MBR was used as the center,and the new node was used as the clustering target,completing the street spatial data index.Based on the detailed analysis of spatial information,traffic flow,speed,and density were calculated,and then,according to the classification of street types,the hierarchy matrix was established.The front area,pedestrian zone,bicycle,and motor vehicle were planned respectively,thus founding a complete spatial layout model.The simulation results show that the model can realize the reasonable layout of street space and meet the requirements of the layout index.