School of the Earth Sciences andResources;
China University ofGeosciences;
Beijing 100083;
China;
Institute of Land Resources and High Techniques;
China University ofGeosciences;
Beijing 100083;
China;
The Beijing Key Laboratory of Development andResearchfor LandResources Information;
China University of Geosciences;
Beijing 100083;
China;
Beijing Union University;
Beo'ing 100075;
China;