Abstract：Research purposes: In high-speeding railway surveying, the integrated coordinate system is often across several projective zones because railway is too long, so its length deformation is too big to meet the requirements of railway surveying. Therefore, some necessary restricted measures should be taken to make the projection length deformation less than 1/40 000 in order to meet the requirement of accuracy for railway surveying.
Research methods: The cause for length deformation in the coordinate system for railway surveying is analyzed first in this paper, then the mathematical models of establishing a independent section coordinate system for solving the length deformation in the coordinate system are given in order to make the projection length deformation less than 1/40 000.
Research results: The four mathematical methods of establishing a independent section coordinate system presented in this paper can effectively solve the length deformation in the coordinate system.
Research Conclusions: Using four models can solve the length deformation in the coordinate system for railway surveying meet the need of engineering surveying be widely used in railway surveying in easily. The models are very useful to construction of high-speed railway and the future.
2006, Vol. 23 
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