## 5 Scanning Results and Discussion  
Following the indicated modified methodology (Table 1), selected petroglyphs were scanned at the Issyk-Kul Provincial State Historical Cultural Museum-Reserve in Cholpon-Ata in Kyrgyzstan. The scanning procedure was carried out using the Faro Focus X330 scanner. From among the exhibits, it was decided to scan the five objects presented in Figure 7.  
Work on the 3D digitization of petroglyphs has been carried out at the Issyk-Kul Provincial State Historical Cultural Museum-Reserve for the first time in history. It made it possible to document the appearance and condition of the museum's most valuable exhibits. The results (base data, digital models and their parameters), will be transferred to the museum's authorities for eternal storage and use in further scientific research. The number and location of the scanning positions for each object were determined by the team of researchers, taking into account the size of the scanned object and the location of the images of the drawings--petroglyphs. Table 2 shows the GPS positions of these places obtained with the scanning device. Since all the petroglyphs are located in the Issyk-Kul Provincial State Historical Cultural Museum-Reserve, their location is already widely known; thus, presenting the GPS coordinates does not increase the risk of theft. Figure 6: Implementation of the scanning of petroglyphs in the museum in Cholpon-Ata. Source: authors’ own. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Object Number** & **Latitude** & **Longitude** \\ \hline \multirow{4}{*}{1 (4 positions)} & 42.658102 & 77.057090 \\  & 42.658042 & 77.057133 \\  & 42.658067 & 77.057237 \\  & 42.658157 & 77.057150 \\ \hline \multirow{4}{*}{2 (2 positions)} & 42.658253 & 77.057732 \\  & 42.658222 & 77.057780 \\ \hline \multirow{4}{*}{3 (3 positions)} & 42.658823 & 77.056525 \\  & 42.658845 & 77.056553 \\  & 42.658873 & 77.056488 \\ \hline \multirow{4}{*}{4 (3 positions)} & 42.659255 & 77.056722 \\  & 42.659273 & 77.056762 \\  & 42.659302 & 77.056722 \\ \hline \multirow{4}{*}{5 (3 positions)} & 42.659370 & 77.057098 \\  & 42.659387 & 77.057155 \\ \cline{1-1}  & 42.659435 & 77.057122 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: GPS scanner positions while obtaining petroglyph data. Figure 7: Petroglyphs selected for scanning. Presented numbers of petroglyphs are used in the following text. Source: authors’ own. The visual arrangement of the objects and the position of the scanner on the premises of the museum are presented in Figure 8. The location and positions for scanning the objects were determined on the basis of the GPS scanner position readings. As a result of the scanning, clouds of points for individual boulders with petroglyphs were obtained, and then base 3D meshes were generated on this basis. Figure 9a shows an example of the obtained point cloud with the visualisation of the point density. The final result in the form of a generated 3D mesh, together with the visualisation of the mesh density, is shown in Figure 9b. Table 3 gathers information on the total amount of vertices in the point cloud and the average point cloud density on the petroglyph surface for each object, together with the number of images of the generated mesh and the size of the base file. The density of the acquired point cloud makes it possible to detect carvings forming petroglyphs. The 3D meshes are base ones which can be a source for dissemination models that, together with other data (e.g., GPS coordinates), can be used for different types of presentations, including virtual reality [40; 41]. Table 4 presents a summary of the surfaces of individual boulders containing petroglyphs. The colour of the surface as well as the presence of carvings and unevenness are shown. It can be observed that the indentations corresponding to the petroglyph drawings are visible only for objects 1 and 5. In the case of object 2, a faintly distinguishable flat dimple can be observed in the area of the drawing (indicated by a red line).