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A Generic Data Model Proposal For Multi-Dimensional Road Object

A new, generic approach to the conceptual data modeling of multi-dimensional highway information system is presented in this study . The current status, which is analyzed in various countries namely; Turkey, Denmark, Germany and the U.S.A, reveals many problems and the success of the implemented systems are not clear. The multi-dimensionality of road object is generally ignored, where it can be static or dynamic, referenced to one, two, three or four-dimension. Furthermore, the restriction of current data models limits the ability of GIS to effectively model the real world. These problems mainly conclude insufficient user requirement responses, unpredicted data integration problems and finally lack of efficiency. This generic approach diverges from the current conceptual data models, since it bases on the decomposition of geometry, topology and thematic data. It presents a considerable departure from traditional planar, centerline based, transportation network in order to comprehend the user assessments. The data model is designed with four distinct components; being geometry, topology, road events and metadata. The first priority is given into geometry, where current models mainly emphasize on the thematic data component. The basic component geometry is defined in third dimension. Topology, being non-planar and having abstraction levels, is modeled as a logical abstraction of geometry. By means of the newly developed methodologies, one-dimensional road information is transformed into third dimension and integration is achieved. The designed concepts are successfully implemented using the integrated approach in one object-relational system on a pilot project. During the implementation of the concepts two different GIS software are utilized and results are evaluated.