Further Developments in OD Data Fusion Methodologies
This paper reports on further stages in the development of the origin and destination (OD) Data Fusion (ODDF) methodology presented at the European Transport Conference in Glasgow in 2010. As previously, the work was undertaken for the UK Highways Agency by a team led by Hyder Consulting. The ODDF work aims to provide a methodology to generate OD trip matrices together with a measure of their reliability/precision, from prior trip matrices and flow count data. The integral manner in which the variability of the input data and of the output results is considered provides a distinguishing feature of the methodology. The work reported here provides a mathematical basis while also demonstrating the methodology on a large scale application, namely for the M25 area of London. Trip matrix estimation is widely used but its results are not always accepted as valid and some guidance suggests that it should only be used to a limited degree. At the same time, widespread instrumentation of the highway network means that large volumes of traffic count data are routinely collected, and other forms of data on speeds and travel patterns are enabled by global positioning system (GPS) and ANPR systems. The OD fusion project confined itself to count data, but remained mindful of these other forms so that its approach could reasonably be extended to fuse these other potential data sources. The matrix estimation/OD fusion problem is specified in the form of an optimisation problem, while earlier stages of OD fusion work used numerical simulation methods to solve. The use of simulation was continued in the present work as its flexibility readily allows different forms to be examined, but further mathematical analysis provided a (Weighted Least Squares) analytic formulation based on standard statistical foundations. An implementation of the analytic formulation was compared with an equivalent implementation using simulation, as well as with varied other formulations (Maximum Likelihood, etc.).
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Supplemental Notes:
- Abstract used by permission of Association for European Transport.
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Corporate Authors:
Association for European Transport (AET)
1 Vernon Mews, Vernon Street, West Kensington
London W14 0RL, -
Authors:
- Skrobanski, G
- Logie, M
- Black, I
- Fearon, J
- Dong, Y
- Gilliam, C
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Conference:
- European Transport Conference 2012
- Location: Glasgow , Scotland
- Date: 2012-10-8 to 2012-10-10
- Publication Date: 2012
Language
- English
Media Info
- Media Type: Digital/other
- Features: Appendices; Figures; Maps; References; Tables;
- Pagination: 53p
- Monograph Title: European Transport Conference 2012
Subject/Index Terms
- TRT Terms: Global Positioning System; Optimization; Origin and destination; Speed; Traffic counts; Traffic flow; Travel patterns
- Geographic Terms: Greater London
- Subject Areas: Highways; Planning and Forecasting; I72: Traffic and Transport Planning;
Filing Info
- Accession Number: 01539778
- Record Type: Publication
- Files: TRIS
- Created Date: Oct 1 2014 3:49PM