成渝地区时空压缩格局的模拟:一个改良的时空图制图模型  

Simulation of Time-Space Compression Pattern in Chengdu-Chongqing Region:an Improved Time-Space Mapping Model

作　　者：葛恒衡 阎建忠[1] 王涛[1] GE Hengheng;YAN Jianzhong;WANG Tao(College of Resources and Environment, Southwest University, Chongqing 400715, China)

机构地区：[1]西南大学资源环境学院,重庆400715

出　　处：《西南师范大学学报（自然科学版）》2022年第1期82-90,共9页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(41761144081).

摘　　要：针对已有时空图制图模型中存在的数据来源单一、应用范围受限、数据要求过高等问题,该文提出以路径优化为思路、Dijkstra算法为基础的制图模型改良方法.改良后的模型通过网络爬取来获得OD(Optical Density)数据;Dijkstra算法被用于实现OD矩阵数据的合并;应用多维尺度度量方法,生成最佳拟合空间;使用七参数空间坐标转换算法将拟合空间点位投影至原始地理空间中,并对拟合误差进行可靠性检验.最终依据节点的点位位移和拟合空间的扭曲现象,分析多轮区域时空压缩效应的格局.该文以成渝城市群为例,绘制不同交通网络建设水平下的通行时间时空图,预测规划高铁网建成条件下的未来可达性格局.该文证实了Dijkstra算法在时空图制图模型上的应用可行性,总结了模型改良后具有降低数据量需求及实现数据合并的优势,探索了多种通行方式下地区时空图及规划条件下预测时空图的模拟方法,扩展了时空图制图法的应用范围.In view of the shortcomings of single data source,limited application scope and high data requirement in the existing time-space mapping models,an improved mapping model based on path optimization and Dijkstra algorithm has been proposed in this paper.The improved model obtains OD(Optical Density)data through network crawling.Dijkstra algorithm is used to merge OD matrix data.The best fitting space is generated by multi-dimensional scale measurement method.The seven-parameter spatial coordinate transformation algorithm is used to project the points of the fitting space into the original geographic space,and the reliability of the fitting error is tested.Finally,according to the point displacement of nodes and the distortion of the fitting space,the time-space compression effect pattern of the multi-wheel region is analyzed.Taking Chengdu-Chongqing Urban Agglomeration as a case area,the regional time-space map of transit time under different levels of transportation network construction has been drawn in this paper,and the region's future accessibility pattern predicted under the condition of planned high-speed rail network construction.The feasibility of Dijkstra algorithm's application to time-space mapping method has been confirmed,the advantages of the improved model summarized in reducing the demand of data volume and realizing data consolidation,the methods of drawing time-space maps explored under various traffic modes or prediction conditions,and the application scope of time-space mapping method expanded.

关 键 词：时空压缩 DIJKSTRA算法 时空图 成渝城市群 OD数据处理 可达性预测 

分 类 号：X321[环境科学与工程—环境工程] U125[交通运输工程]