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High-speed Railway Precision Projection Distortion Model

CHEN Ke ZHANG Xianzhou LI Zhipeng ZHEN Yanan(Geosciences and Environmental Engineering,Southwest Jiaotong University, 111 North Section 1,Erhan Road,Chengdu 610031,China)  
We put forward three kinds of calculation model for constructing the engineering ellipsoid and coordinate transformation.At last,we summarize the optimal method for constructing the engineering ellipsoid of high-speed railway in order to make sure the best fit of existing projection plane and the engineering ellipsoid.
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