In recent, the ArcGIS TM transportation data model has designed for NewYork. We aimed to develop this data model for Iranian roads network.
2. GIS_T
GIS for Transportation (GIS-T) is a broad expression that encompasses all of the activities that involve the use of Geographic Information Systems for some aspect of Transportation planning, management, or science. Government agencies, research institutions, and members of private industry are just some of the entities that routinely build GIS-T applications. These applications can involve any mode of transportation (truck, automobile, train, ship, bus, airplane, etc.), or may consider other transportation related objects such as pavement, stop signs, or construction equipment. GIS-T applications can be used to monitor traffic accidents that have occurred in the past, or they can plan for changes in the transportation network design for the future. The breadth of the field of GIS-T provides ample opportunities for the development of new and innovative applications, and at the same time presents challenges to those who will try to integrate such diverse activities.[1]
GIS-T can be an integral part of Departments of Transportation at the State and Federal levels of government. Local, regional, and national bus operators implement GIS-T applications for routing and scheduling. Trucking and delivery companies build applications to track their shipments. Municipalities develop routes for their snow removal and sanitation services. Researchers use GIS-T to design new routing algorithms or improve
