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原文传递 Development of a Prototype Master Network System for FSUTMS. Final rept.

题名：	Development of a Prototype Master Network System for FSUTMS. Final rept.
作者：	Gan-A.; Liu-K.
关键词：	Master-network-system; Prototype-; FSUTMS-; Geodatabase-format.;Modeling-networks; Demand-modeling; Network-inconsistencies.
摘要：	Maintaining modeling networks in travel demand modeling has been a time-consuming and problematic process. In a typical demand modeling application, multiple versions of a network are usually created to represent the different network conditions associated with different model years and alternatives. Traditionally, these networks are modified individually and stored in separate network files. The process is cumbersome and is prone to network coding errors that result in network inconsistencies. This has led to an increased interest in the modeling community to use the 'master network' approach of building and maintaining modeling networks. Unlike a traditional network, a master network combines the base-year and all future-year networks in single, integrated, and consistent spatiotemporal database. To work on a particular network, the user would simply indicate the timeline of a specific network to extract from a master network. After an extracted network is modified, it can be merged back into the master network. During the merging process, changes to the network can be automatically applied to other networks in the master network. This does not only save time from repetitive manual network editing, but also avoid potential inconsistencies among the different scenario networks. This research report describes a standalone master network system that was developed to work with Cube Voyager - the modeling engine of the Florida Standard Urban Transportation Model Structure (FSUTMS). Stored in ESRI's Personal Geodatabase format, the mast network database structure was designed to minimize data storage space, extract efficient networks with consolidated links, support open and unlimited data attributes, and implement both forward and backward network propagations. While the current structure was designed for only highway networks, it can be extended to transit and TAZ networks. The system has been successfully tested with both small and large networks and is ready for deployment to various FSUTMS models.
报告类型：	科技报告