Evaluation of Compatibility among Network Adjustment Software: CoMeT, LGC, and Trinet+
Publication: Journal of Surveying Engineering
Volume 146, Issue 2
Abstract
A network adjustment program is an essential tool for surveyors. It allows the computation of point coordinates and confidence regions from measurements undertaken in the field. It also helps surveyors in the design of optimal networks, both in terms of accuracy and reliability. Conservatoire national des arts et métiers (Cnam), European Organization for Nuclear Research (CERN), and School of Management and Engineering Vaud (HEIG-VD) are three institutions that have developed their own network adjustment applications: Compensation de Mesures Topographiques (CoMeT), Logiciel Général de Compensation (LGC), and Trinet+, respectively. In all these applications, three-dimensional (3D) mathematical functional models are used to process conventional observations and global navigation satellite system (GNSS) 3D vectors. However, some discrepancies may exist in the obtained results between these applications due to differences in the implementation of the functional models. The main objective of this work is to study software effects, and to ensure compatibility and interoperability between these three network adjustment applications. We first present the relevant differences between these applications and then the processing methodology adopted to ensure the best compatibility and interoperability between them. Using generated measurements, which include Gaussian errors, we have been able to study the impact of any differences in the implementation of the functional models on the estimated variance factor and adjusted parameters.
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Data Availability Statement
All data generated during the study are available from the corresponding author by request (point coordinates and generated observations between points for each network).
Acknowledgments
The authors gratefully thank the editor and the reviewers for their comments and suggestions that helped to improve the original manuscript.
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Published In
Journal of Surveying Engineering
Volume 146 • Issue 2 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Mar 26, 2019
Accepted: Sep 19, 2019
Published online: Feb 11, 2020
Published in print: May 1, 2020
Discussion open until: Jul 11, 2020
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