The physico-geographical conditions of the Carpathian region, where a dense network of main gas pipelines is located, necessitate the construction of numerous overhead crossings over watercourses, ravines, and other obstacles. Approximately 80% of these pipelines have been in operation for over 25 years, leading to changes in their technical condition and the physical-mechanical properties of their materials. These factors highlight the need for geodetic monitoring of the overhead gas pipelines to ensure their efficient and reliable operation. Geodetic methods allow for the determination of the spatial position and changes over time of the structural elements of these crossings. The use of modern electronic total stations enables indirect observations in reflectorless mode, improving safety for surveyors. However, the accuracy of spatial coordinate determination using total stations in reflectorless mode requires further study. This research aims to evaluate the accuracy of spatial coordinate determination of pipelines using electronic total stations in reflectorless mode and to establish the maximum beam reflection angle from the pipeline surface at various distances.
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