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Digital Earth" and Informationization of Surveying and Mapping

SUN Yi,WANG Cheng-wu ( Huaian Building Property Trading Administration , Huaian Jiangsu 223001 ,China; Huaiyin Institute of Technology, Huaian Jiangsu 223001,China)  
Since Al Gore, the former U. S. vice - president,proposed the concept of " Digital Earth" , many countries have been discussing how to cany out their own "Digital Earth" strategies . Undoubtedly,carrying out "Digital Earth" strategies has very important significance on the informationization of surveying and mapping.
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