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On The Results of a Workshop on Generic Data Model for Linear Referencing Systems
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1994-08-06
[PDF-845.66 KB]
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Abstract:The significance of linear referencing methods and systems to transportation applications has been recognized for some time. A recent executive-level commitment to the concept of a National Spatial Data Infrastructure (Mapping Science Committee, 1993) has spurred interest in the development of standards and common models for data. The Ground Transportation Subcommittee of the Federal Geographic Data Committee has recommended that a linear referencing system be incorporated in standards efforts. On August 6, 1994, forty-two transportation professionals, systems developers, and academics came together in a workshop in Milwaukee, Wisconsin with the objective of preparing a draft consensus conceptual data model, at the entity- relationship level, for linear referencing systems. Recognizing that it was not feasible to derive a data model that would meet all the needs of all application areas, a generic model was sought that met common needs and formed a core that could be extended as needed in specific application areas. The resulting draft data model, in object modeling form, associates transportation data with multiple cartographic representations and multiple network models through a single linear datum. The datum links the data model to real-world features and provides the referencing space that enables transformations among linear referencing methods, networks, and cartographic representations at various scales. The data model supports a set of fundamental operations that cause data to flow between the database world and the real world. The data model as presented is intended to represent the requirements for a linear referencing model - it is not intended as a specification.
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