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store and access spatial data. The establishment and 
maintenance of spatial objects and spatial index table are 
automatic and transparent to users. Using spatial index table, 
user can query data and accumulate table as before, and also 
can write query to return spatial feature, or use spatial feature in 
request. 
SDE provides a series of steady geometrical and spatial 
analytical functions. These functions decide the relationships of 
different geographic features, for example, if they are intersected, 
if they share a point or boundary, if they share a region, or if one 
object contains another object. Furthermore, SDE can also 
support some other spatial functions, such as cut, buffer 
generalization, distance computing and polygon overlap, etc. 
3. CONCLUSION 
With the development of INTERNET, establishing electronic chart 
on the web and building electronic chart website become more 
impending than before. The building of Web-database of 
Electronic Chart involves many new technologies in GIS, 
computer technology, ocean transportation, etc. Researching in 
these technologies will promote the development of ocean 
transportation information 
4. REFERENCES 
J.Y.Gong.etc Design and implementation of Object oriented 
Integrated Spatial Database Management System, Journal 
Wuhan Technical University and Surveying and Mapping 1998 
Q.Li,etc Research of Web-GIS Geographic Relational Database 
Model, Beijing University Journal of Beijing University 1999(3) 
Yin lianwang et al. 1999.Research on WebGIS Base Geospatial 
Information Generalization with Varying Map Scale. Journal of 
Image and Graphics 
Figure 1 Object Oriented Electronic Chart Database Architecture