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• Data Indexing and Retrieval Service: This service links 
Data Service and other functional components, and 
provides convenient approaches to retrieve data. 
• Spatial-temporal Data Topology Analysis Service: This 
service analyzes geographic information and navigation 
information to make decision and forecast. 
• Algorithms Library: All basic algorithms of ocean 
transportation. 
• Display and Edit Service: Through this service, users can 
display and edit static geographic information and dynamic 
transportation information. Through it we can construct the 
friendly user interface. 
3.4 User Application Service 
Based on different users special demands, this service provides 
additional application component to satisfy user. 
4. CONCLUSION 
Through the discussion above, we can see that the distributed 
GIS-OT can get perfect result and give a development direction to 
resolve sophisticated ocean transportation. But there are still 
many difficulties to overcome in some key technologies. We still 
need do more research in this field. 
5. REFERENCES 
H.Y.Han, J.Y.Gong, X.R.Yuan, 2000, B/S-Based, Distributed, 
Heterogeneous Spatial Database Integration, Journal of Remote 
Sensing, P.R.C. 
S.P.Chen, 1999, Urbanization and Urban GIS, Science Press, 
P.R.C. 
PS.Zhao, C.J.Yang, 1999, The Studies on the Architecture of 
Web-GIS, Towards Digital Earth-Proceedings of the International 
Symposium on Digital Earth, Science Press, 1999, P.R.C 
Jean-Claude Thill, 2000, Geographic Information Systems for 
Transportation in Perspective, Transportation Research Part C, 
U.S.A. 
Different User Application 
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Figure 1. The general architecture of GIS-OT