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ACKNOWLEDGEMENTS 
This work was supported by Three Gorges Project Construction 
Committee of the State Council Project ‘The Dynamic and 
Real-time Monitoring of Ecology and Environment in Three 
Gorges Project’ (SX 2002-004). The authors thank Distributed 
Active Archive Center of National Snow and Ice Data Center 
(NSIDC) for providing the GLAS data and many helps. 
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