Research on Selection of Engineering Coordinate System and Coordinate Transformation Method for High-Speed Railway
DOI:
https://doi.org/10.54097/1y5cnj88Keywords:
High-speed railway, Engineering coordinate system, Coordinate transformation, Projection deformation, Bursa modelAbstract
In view of the engineering characteristics of high-speed railway long and narrow linear projects, such as large span, significant topographic relief, and strict control of projection deformation, the traditional national unified coordinate system can hardly meet the accuracy requirement that the projection length deformation is ≤ 2.5 cm/km. Taking high-speed railway engineering survey as the research background, this paper sorts out the core theories and selection principles of engineering coordinate systems, constructs mathematical models including ellipsoid transformation and Bursa seven-parameter transformation, and carries out projection deformation calculation and coordinate system optimization design with examples of Taibai-Fengxian Expressway and typical mountainous railway sections. The results show that by customizing the compensation elevation plane and adjusting the position of the central meridian, the elevation deformation and Gauss projection deformation can be effectively compensated, and the global deformation value can be controlled within 1/43000, which meets the accuracy specifications for high-speed railway engineering survey. The coordinate transformation method based on the seven-parameter model enables the accurate connection between the national coordinate system and the independent engineering coordinate system. The coordinate system selection strategy and transformation method proposed in this paper can provide practical references for the coordinate system design of similar linear projects.
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