多源数据融合法更新公路通道车流OD矩阵

A Method to Merge and Correct Vehicle OD Matrix for Highway Corridor Utilizing Multi-source Data

为了低成本地获取高速公路改扩建时交通运行管理用的更高精度公路通道车流OD矩阵,提出了基于工程预备阶段调查车流OD、互通出入口流量、部分路段流量等多元数据融合法更新分车型车流OD矩阵的新方法.该方法基于线性回归法识别需要调整的OD对,并结合互通与交通小区的映射关系调整OD;再利用χ2检验比较分配得到的路段流量与调查得到的路段流量的一致性,以判断调整后OD的准确性.该方法为提高车流OD的精度实行了双重校核.用该方法对京港澳高速公路(河北段)改扩建区域OD调整校核进行了实例分析,结果表明,在数据来源可靠的情况下,可实现对区域OD的更新和校核.

In order to inexpensively obtain vehicle OD matrixes with high accuracy for highway corridor that needed in traffic operation management while reconstructing, a new method to correct vehicle OD from different vehicle types is put forward. This method merges data like survey OD obtained in pre- paratory stage of the project, entrance and exit traffic volumes and partial link traffic volumes. Those OD pairs that need to be adjusted are identified by using unitary linear regression method. And then adjust them using mapping relation between interchanges and traffic zones. After adjusted, the accu- racy of the OD matrixes is judged by comparing corridor link flows from assigned and observed with the method of χ2 test. Double-check was conducted for improving the accuracy. This method was ap- plied on a segment of freeway from Beijing to Hong Kong and Macao as a case study. The results show that, if original data are reliable, regional OD matrixes could be updated and checked.