different data sources.But there exists a drawback that it can 
only detect changed and unchanged area, not “from-to"change 
type.The further study aims to detect changing contents by 
object recognition or image classification techniques. 
Hua L.Xu for supplying encouragement during the study. This 
paper is supported by Key Laboratory of Geo-informatics of 
State Bureau of Surveying and Mapping, China. (Grant No. 
200727). 
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Acknowledgements 
I would like to thank Digital Globe for providing the above 
experimental data. Moreover,special appreciation to my friend