Control Method of Projection Deformation in High Altitude Area of Balkan Peninsula
In route control survey,if the route crosses the narrow strip area and the elevation span is large,the length projection deformation is an unavoidable problem.The control network is a unified coordinate elevation datum frame for a region or survey area,and it is an important factor to ensure the measurement accuracy.When the length deformation of the survey area is greater than 1/2 of the allowable error of the structure,the length deformation must be controlled.Combining with the Bar-Boljare Highway project in Montenegro,in the paper the correction principle and control method of the projection deformation in the Balkan Peninsula area in the Bessel-1841 ellipsoid framework are described:to divide the lines into zones,to define the elevation and the projection proportion to correct the horizontal distance,to control the projection deformation caused by the difference between the Gauss projection length deformation and the baseline elevation within the allowable range,so as to meet the construction lofting accuracy of the structure.
line measurementBalkan Peninsulahigh altitude areaprojection deformationmeasuring scale
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