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Transportation data model implementation for Iranian roads network
6. Need analysis
With consider to the need analysis that is done for transportation organization of Iran,
the following data is needed to build a geodatabase for Iranian roads network:[2]
- Data related to roads ( such as freeways, highways, main roads,etc. )
- Foundations (such as terminals, parkings, facilities, police stations,etc.)
- City centers (such as province centers,etc.)
- X,Y and speed of mobile objects.
And also the following analysis is needed:
- Overlay
- Buffering
- Network analysis
- Terrain analysis
- Statistical analysis
- Point in polygon
- Query
- Location/allocation
- Visualization
With concider to above mentioned analysis and capabilities that are needed by a
transportation data model , we choose some existance GIS software package and assessed
them to find best software to develop a data model for Iranian roads network.
The following table shows the result of the assesment of different GIS software
packages.(See table 1)[2]
Table 1. Comparison of different GIS software package
Based on the assessment of different software packages, it concluded that some of
those package such as ArcGIS, LaserScan, Cadcorp, SmallWorld are suitable for Iranian
Transportation Data Model and with more consideration from the above presented
comparison, the following conclusions can be made that ArcGIS software package is the
best choice for this purpose.
7. Implementing the ArcGIS Transportation Data Model
The following steps describe the process of designing the ArcGIS transportation data
model:
- The Analysis Diagram can be used as a template to make initial decisions
about which objects to use and how to organize them into a logical structure
that is appropriate for the applications being developed.
- The UML Diagrams specify the specific attributes and behaviors of the objects
to be employed, and the relationships between objects and between logical
groupings of objects. The UML can be used to create an empty geodatabase
structure within ArcGIS™.
- Both the Analysis Diagram and the UML Diagrams representing the ArcGIS™
Transportation Data Model were generated in the Visio 2000 Software
Package.
- Exporting the UML to a Microsoft Repository within Visio 2000
- Creating a new Personal Geodatabase in ArcCatalog in which the empty schema will be created.
- Once the empty geodatabase schema has been created the geodatabase must be
populated with transportation related data before the ArcGIS Transportation
Data Model can be implemented in an application.
Final result is a geodatabase that is used to managing the transportation network.
8. conclusion
in this paper we introduce the ArcGIS transportation data model for iranian roads
network.The following conclusions can be made:
- Through the well-established vector data structure, GIS has provided an efficient
means for organizing basic transportation related data in order to facilitate the
input, analysis, and display of transport networks.
- The ArcGIS™ Transportation Data Model is designed to help in the development
of transportation applications. It does so by providing a context within which a
transportation system can be described, and assisting in the development of a
geodatabase.
- Based on the assessment of different software, it concluded that some of those
package such as ArcGIS, LaserScan, Cadcorp, SmallWorld are suitable for
Iranian Transportation Data Model and with more consideration from the above
presented comparison, the following conclusions can be made that ArcGIS
software package is the best for this purpose.
- The ArcGIS™ Transportation Data Model is takes advantage of the flexibility of
Object Orientation to define entities and the relationships among those entities.
9. References
- ESRI and Regents of the University of California,"ArcGIS Transportation Data
Model (Draft)", 2001.
- Dr A.Alesheikh, Developing a system for monitoring trunks and locating them.
KNTU university.
- S.G.Date. Database Management Systems
- www.esri.com
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