Origin-Destination Matrix Adjustment using Split Ratios of Network Nodes

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Asgarian, Mahya | 2020

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 52675 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Shafahi, Yousef
Abstract:
This research presents a model to adjust origin-destination (OD) matrix using split ratios of network nodes. Conventional direct methods for OD estimation are resource intensive and time consuming therefore developing indirect methods which are less costly is important. Split ratios of network nodes can be obtained from nowadays technologies such as Bluetooth sensors with acceptable accuracy. An iterative bilevel estimation framework is presented that uses split ratios and link flows as observations. The upper level problem is to minimize a weighted objective function of the deviation between observed and estimated data. In the lower level the OD matrix is assigned to the network. This model was performed on 3 example networks such as a small synthetic network, a highway and a large-scale network. The results illustrate the effectiveness of using split ratios with link flows in adjusting OD matrix. The effectiveness of using this combined data differs based on the network configurations, method of selecting observed split ratios, number of the observation data and the boundaries that are used to control each OD demand adjustment
Keywords:
Demand Estimation ; Bi-level Model ; Origin-Destination Estimation ; Origin-Destination Matrix ; Traffic Information ; Turning Ratio ; Diversion Ratio

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