XI'NING, Feb. 16 (Xinhuanet) -- A remote sensing survey has shown that the desert area of the Qinghai-Tibet Plateau, also called the roof of the world, has increased over the past three decades.

The survey was launched jointly by the China Aero Geophysical Survey and Remote Sensing Center for Land and Resources (AGRS), Jilin University, Chinese Academy of Geological Sciences, Qinghai Provincial Geological Survey Academy and Hebei Provincial Geological Survey Academy beginning 2003.

The survey focuses on desert area changes, ice line changes, river and lake changes, and geological disasters, said Sun Yangui,a senior engineer with Qinghai Provincial Geological Survey Academy.

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