Naminat O. Improvement of methods for surveying monitoring of linear objects in areas exposed to underground mining.

In the dissertation work solved an actual scientific and technical problem - the development of a technique of mapping line features based on the optimization of the shooting process by taking into account the mutual scanner location and subjects, the use of the work developed by the sequence, reducing the error when scanning the subject. The proposed methodology covers all stages of the surveying process, including preliminary analysis, survey and post-processing of the results obtained with the ultimate goal of obtaining a three-dimensional, reliable and informative model of a linear structure. Using the developed models allows to reduce the time of ground-based laser shooting. The possibility of using terrestrial laser systems for solving the main tasks of mine surveying at linear objects is considered. The proposed technique for constructing a digital model of a linear structure based on the results of a ground-based laser survey, taking into account all developed recommendations for optimizing the process itself. Investigations of the influence of the angle of inclination, color and type of the surface, affecting the accuracy of the LLS measurement, are performed. A study was also made of the effect of the spatial resolution of the NLS and the angle of inclination of the laser beam of the NLS on the accuracy and quality of the results obtained. In this paper, a technique is proposed for determining the error of the sight of the laser beam for further calibration of the LLS, which will improve the accuracy of the data obtained. Optimal shoulders for scanning are determined for further analysis of the spatial position of linear objects. Dependencies are found that affect the scanning density and the magnitude of the error. Thus, the dependence of the influence of the scanner height and distance on the density, the angular step of the scan and the distance on the density, the heating temperature on the accuracy, changes in the linear step of the scan and the distance on the density, and the dependence of the number of points on the distance. Standard deviations of the obtained results are calculated. The implementation of the results will allow us to obtain data not only from the reference line, but also from the whole object, which will significantly increase the areas of detection of the moving processes in the body of the linear object and will allow timely response to the consequences of natural or man-made impacts.