The Research And Realization On The Modeling Method Of Plane Coordinate System About Linear Engineering Survey

With its broad application of in the domain of egineering survey, GPS surveying technique is generally adopted in Linear engineering to implement horizontal control survey and establish an Engineering plane coordinate system by Gauss projection.It is indicated that there exits a dual correction in the direction and distance observed values of tacheometry when handling data in the independent engineering coordinate system set up by Gauss projection. However, it is generally believed that the dual correction of obseved values of horizental directions in practival projection is both quite little,so it is ignored and and dually corrected only in observed values in horizental distances.In spite of that, it is necessary to project the entire line to various Gauss planes to promise that the projection of the length of linear engineering plane survey could match the requirements of revelent criterions, thus resulting in extremely trifled calculation.To solve the two problems mentioned above, this dissertation summaries the methods of how to set up linear engineering survey plane coordinate system by Causs projection and launches a quantitative analysis of the system error correction based on the observed values of tacheometry of reference ellipsoid, espacially into the impact on observed values of horizental directions and distances by deviation of plumb line and manages to work out the deviation of plumb line EGM2008 earth gravity field model by programming and verifies it through the practical engineering examples. Then, the author introduces the basic theories of road engineering gradient plane coordinate system and deduces particularly the mathematic and function model in GPS data processing under this system. In the end, the author concludes the data processing methodsand compiles the data processing software of plane survey of tacheometry and verifies its accuracy through practical engineering examples and compares their calculation effeciencies.By theorical verificaion and example analysis, it is demonstrated that the impact on observed values of horizental directions and distances by deviation of plumb line can’t be ignored and therefore should be corrected; road engineering gradient plane coordinate system has rigor theorical bases and keeps indifferent to the length of entire line, so the observed values of tacheometry can be directly caculated and the designed can be directly lofted without dual correction, considering the deviation of plumb lines of GPS and tacheometry data, thus is the ideal road engineering gradient plane coordinate system; the data processing of plane survey is correct in its caculation results and highly efficient.