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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
