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Track: Transportation, Logistics Planning
Otto Nielsen
Technical University of Denmark
IPF Building 115
Lyngay, 2800
DENMARK
Telephone: 011-45-45-251514
Fax: 011-45-45936412
E-mail: dnielsen@iutb.dtu.dk
Thomas Israelsen, Erik Nielsen
GIS-Based Methods for Establishing the Data Foundation for Traffic Models
Traffic models demand large amounts of data, some of which are traffic network topology, traffic network data, zone data, and trip matrices. GIS is a natural tool for handling most of these data as it can ease the work process and improve the quality control. However, traffic models demand a complex topology not very well covered by the traditional GIS topology. The paper describes a number of applications where ArcInfo and ArcView have been used to automate the process of building a traffic network topology. The methodology has been used on a number of full-scale models from medium-sized urban areas to metropolitan areas (Copenhagen, Denmark and Bandung, Indonesia). The paper covers key subjects in the work process, which has been eased considerably by using AML and Avenue scripts: - Establishing network topology from different data sources - Semiautomatic procedures for attaching zones and zone centroids to the network - Handling intersection data including automatic generation of node data and turn
data from link attributes - Handling green waves - Handling many project alternatives in a consistent way without redundant data Some of these tasks would have demanded an overwhelming work effort to carry through with traditional non-GIS based approaches. In addition, the paper discusses how the GIS can interact with the traffic model algorithms (typically external applications). Finally, needs for further integration between GIS and traffic models are discussed and examples of work-arounds are given.
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