The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B6b. Beijing 2008 
+ 
Sp(t 2 ) 
-H 
Pk(2) 
Sp(t 3 ) 
+ 
+ Pk(3) 
Figure 6. Algebraic operator of change-only exchange file. 
6. CONCLUSION 
The paper develops the method of change detection based on 
object match among different version databases, delivers the 
process of object match and change taxonomy. The change- 
only information only record the changes happened about 
geographic objects, and at a limit time span its volume is very 
small to updating client database quickly and conveniently. 
Also we don't need the uniform identifier in database system, 
which is very important for client user because the identifiers in 
client system are often inconsistent with master database in data 
centre. And the exchange files based on XML of published 
change-only information is feasible to implement and integrate. 
ACKNOWLEDGEMENT 
This research is supported by the National Key Technology 
R&D Program of China under Grant No. 2006BAB10B00. 
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