ISPRS, Vol.34, Part 2W2, “Dynamic and Multi-Dimensional GIS’’, Bangkok, May 23-25, 2001 
• describe the object model with IDL; IDL specifies the 
interface to a server. IDL is a standard language that 
allows a programmer to define the interfaces to 
CORBA objects. Clients use these interfaces to access 
objects across a network. 
• Implement the interfaces. Because CORBA does not 
dictate a particular language to use, it gives application 
developers the freedom to choose the language that 
best suits the needs of their applications. Taking this 
freedom one step further, developers can also choose 
multiple languages for various components of an 
application. For instance, the client components of an 
application might be implemented in Java, which 
ensures that the clients can run on virtually any type of 
machine. The server components of that application 
might be implemented in C++ for high performance. 
CORBA makes possible the communication between 
these various components. 
6. CONCLUSION 
A distributed GIS is quite different from a stand-alone GIS. For 
interoperability, the new GIS platform need conform the 
specification of OpenGIS. So the spatial reference system and 
spatial data interchange is necessary. Spatial query and spatial 
data retrieve is important for domain application. GML is a new 
method for spatial data storage. The integration of CORBA and 
GML is the future of distributed GIS. Then the method of 
building a distributed GIS with CORBA is introduced 
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