## 6 Conclusions  
In the light of the conducted research, the following conclusions can be drawn:  
Terrestrial laser scanner technology enables accurate documentation of petroglyphs, including their 3D geometry, external appearance, GPS position, and location in relation to the north/south direction, which allows for precise positioning of these objects on satellite photos and/or digital maps.  
The possibilities of modern 3D TLS and the developed methodology for their effective use are presented in the example of the performed three-dimensional scanning of petroglyphs at the Issyk-Kul Provincial State Historical Cultural Museum-Reserve in Cholpon-Ata in Kyrgyzstan.  
The obtained results of scanning five petroglyphs, i.e., the lack of indentations practically visible in mesh models (petroglyphs no. 3 and 4) resulting from carving the drawing on the surface of the stone, confirms the reports that the petroglyphs were poorly restored. The thesis that the coatings of the maintenance layers became less transparent as a result of aging, and the contours of the recesses were blurred, was confirmed  
Unfortunately, the museum authorities were unable to provide information about the used method of petroglyphs preservation (e.g., method of film application, layer thickness, number of layers etc). This prevents the possibility of comparing the acquired results with other existing reports on the preservation of petroglyphs in other museums and their results.  
Before future maintenance activities which should clean petroglyphs from the wrong protective layer, an accurate inventory should be carried out in order to obtain complete information, in the digital version of 3D models using modern technologies for 3D digitization.  
During the research, a small number of the Issyk-Kul Provincial State Historical Cultural Museum-Reserve petroglyphs were scanned. The obtained data made it possible to verify the correctness of the developed scanning methodology and the high quality of its results. The next steps should be to scan the remaining artifacts in order to obtain a complete digital documentation of the petroglyph field. Digital models could be used by scientists from different disciplines for further research (e.g., to show different tools or techniques used for creating the rock art, to detect erosion patterns, etc.) without the need to study petroglyphs on site, for example [42].  
Conceptualization, M.M.; Data curation, N.I.; Formal analysis, M.M.; Investigation, N.I.; Project administration, J.M.; Resources, J.M. and N.I.; Software, J.K.; Visualization, J.K.; Writing--original draft, J.K.; Writing--review & editing, M.M., J.M. and N.I. All authors have read and agreed to the published version of the manuscript.  
The work was co-financed by the Lublin University of Technology Scientific Fund FD-20/IT-3/007.  
Not applicable.  
**Acknowledgments:** The authors thank the authorities of the Lublin University of Technology in the persons of former Rector: [PERSON], former Dean of the Faculty of Electrical Engineering and Computer Science: [PERSON], and Head of the Department of Computer Science: [PERSON], for co-financing scientific expeditions of the Lublin University of Technology to Central Asia.  
The authors declare no conflict of interest.