Exploration Problems of Establishing the Plane Coordinate System for Highways
[Purposes]This paper aims to solve the problem of establishing a plane coordinate system for highways,improve the measurement accuracy of the plane coordinate system,and effectively ensure the quality of engineering construction.[Methods]Based on the calculation formula and error tolerance theory of Gaussian conformal projection error,the author analyzed the composition of Gaussian conformal projection error and the size of each part.Using the translation amount,the central meridian and projec-tion height of the highway plane coordinate system were calculated,and the control point coordinates un-der the standard coordinate system were transformed into coordinates under the new coordinate system.[Findings]The accuracy of the new coordinates was checked,and the difference between the horizontal distance obtained through coordinate inverse calculation and the measured horizontal distance between the two points was within the allowable range.A new coordinate system was established to meet the accu-racy requirements of highway engineering.[Conclusions]Practice has shown that the plane coordinate system of highways can be established into any Gaussian orthomorphic projection plane rectangular coor-dinate system with compensated elevation plane based on the calculated central meridian and projection height,and the deformation of each control point under the new plane coordinate system can meet the specification accuracy and design requirements.
plane control surveyarbitrary bandgaussian projectionelevation projection surfaces
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