Abstract
For the construction of various civil engineering structures, particular care should be taken in the perspective of geodetic control. Therefore, the design and implementation of the geodetic network deserves special attention. This paper is focused on various aspects of datum definitions for tested micro-triangulation network. It was shown that the geometrical distribution of datum points in a minimally constrained solution has a great impact on the accuracy of the geodetic network. Estimates of the accuracies of individual station y-x coordinates, error circles and error ellipses, obtained by free adjustment, where the datum selection was independent of errors in fixed coordinates, revealed much better quality of control points.
Highlights
Engineering construction requires a joint participation of experts from various fields, including those from the field of geodesy [1,2,3,4,5]
This study clearly shows that more complete information about the uncertainty of the position of control points is obtained when using error ellipse, as opposed to the usual methods of accuracy assessment in the directions of the coordinate axes or by error circles
Other than describing the uncertainty of the position of a point, a great advantage of the error ellipses lies in the fact that a visual comparison of achieved accuracy in any two points can be done
Summary
Engineering construction requires a joint participation of experts from various fields, including those from the field of geodesy [1,2,3,4,5]. The realization of geodetic control networks is one of the most important tasks for surveying engineers. Through the stake-out process, geometry of the designed structure is transferred onsite — both in horizontal and vertical sense During such a task it is important to know the required precision of the stakeout; which is defined through the permitted deviations for the measurements and geometrical tolerances connected with the structure’s location. On the basis of the coordinate errors for control geodetic network, and the errors in stakeout element measurements, it is possible to predict the accuracy that will be achieved during the stakeout of the structures’ individual points [7]. Global and local position accuracy of the control points is expressed through standard deviation in the direction of the coordinate axis or total positional error. In terms of a concrete example of the engineering 2D micro-triangulation network, the uncertainty of the points depending on the selection of the datum of geodetic network, was tested and analyzed
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