Abstract
Net adjustment is one of the basic tools for various surveying tasks. Among the transformation of coordinates or the analysis and comparison of geometries, the adjustment of geodetic networks is an important part of the surveyor’s work. The market offers a number of software solutions, both commercial and freeware.
Seeing the range of software solutions, the question arises, whether the programs give equivalent results. Earlier evaluations of net adjustment programs, partly including New River Kinematics’ SpatialAnalyzer (SA), revealed on the one hand almost identical adjustment results for the classic programs. On the other hand, the evaluations showed that SA, using a different mathematical model (bundle adjustment), yields clearly distinguishable deviations. Hence, in this paper the authors focused on SA with the classic programs as reference. The first part of the comparison deals with the results of evaluating a terrestrial network. As programs do not account for the earth’s curvature in a standardized way, the chosen network is of small size to minimize the influence of the curvature to an insignificant level.
The second part of the paper compares the results of the evaluation of basic geometries (plane, circle, cylinder, sphere) using SA and other software packages with the least squares solution obtained in a rigorous Gauss–Helmert model (GHM).
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Acknowledgments
The authors thank COS Geoinformatik GbR for providing the measurement data of the network. Furthermore they thank Alexander Hiller of VMT GmbH as well as Scott Sandwith and Joseph Calkins of New River Kinematics for the open discussion and help.
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Herrmann, C., Lösler, M., Bähr, H. (2015). Comparison of SpatialAnalyzer and Different Adjustment Programs. In: Kutterer, H., Seitz, F., Alkhatib, H., Schmidt, M. (eds) The 1st International Workshop on the Quality of Geodetic Observation and Monitoring Systems (QuGOMS'11). International Association of Geodesy Symposia, vol 140. Springer, Cham. https://doi.org/10.1007/978-3-319-10828-5_12
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DOI: https://doi.org/10.1007/978-3-319-10828-5_12
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