Guidelines for the implementation of multimodal transportation location referencing systems.

Author(s)
Adams, T.M. Koncz, N.A. & Vonderohe, A.P.
Year
Abstract

This research produced a data model that can be adopted by transportation agencies, by transportation geodata standards groups, and by Geographic Information System in transportation (GIS-T) software vendors. The research (a) established consensus based functional requirements for a transportation multimodal, multidimensional location referencing system (MDLRS) data model; (b) developed an MDLRS data model that meets these functional requirements; and (c) developed guidelines for implementing the MDLRS data model in transportation organisations. Through a workshop of stakeholders, this research identified ten core functional requirements that form the essence of the MDLRS data model: spatiotemporal referencing methods, temporal referencing system/temporal datum, transformation of data sets, multiple cartographic/spatial topological representations, resolution, dynamics, historical databases, accuracy and error propagation, object-level metadata, and temporal topology/latency. A number of existing data models and standards were considered in the formulation of the MDLRS data model. None of these existing models and standards supported all of the functional requirements. However, as a group, they provided many of the building blocks for the MDLRS model. Conceptual and logical schematics of the MDLRS were established. The conceptual model illustrates the semantics of the model as they relate to the central concepts of the transportation feature and event being referenced to systems that are based on linear and nonlinear data. To support interoperability, the logical model is expressed in unified modelling language (UML) notation. The UML local data model is in a normalised form in which object classes can be created directly from the model. The MDLRS model uses Co-ordinated Universal Time (UTC) and the Gregorian calendar as the temporal datum and operates on the assumption that there is one temporal reality of a phenomenon along a timeline. Temporal relationships are used to derive temporal topology. The MDLRS model distinguishes between the spatial and temporal elements of objects. It uses scale applicability as the central notion for maintaining consistency of multiple geometric and topological representations. (A) This report may be accessed by Internet users at http://gulliver.trb.org/publications/nchrp/nchrp_rpt_460.pdf

Publication

Library number
20011948 ST [electronic version only]
Source

Washington, D.C., National Research Council NRC, Transportation Research Board TRB / National Academy Press, 2001, 79 p., 75 ref.; National Cooperative Highway Research Program NCHRP Report ; 460 / NCHRP Project SP20-27(3) FY'96 - ISSN 0077-5614 / ISBN 0-309-06708-1

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