ISPRS, Vol.34, Part 2W2, “Dynamic and Multi-Dimensional GIS", Bangkok, May 23-25, 2001 
117 
5. Conclusions 
New technologies are being developed fast. The new 
methods of data capturing produce more and more 
spatial data. How to manage and interoperate these 
data is a big problem. Federated spatial database is 
an ideal solution. After discussing the concepts of 
federated spatial databases and interoperability, a 
data model of federated spatial databases is brought 
out in this paper. But further researches should be 
carried out on the interoperability among.vector 
database, DEM database and image database. We 
are working on it. 
ACKNOWLEDGMENTS 
Research support from the national outstanding 
young people science foundation (49525101) 
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