[H-TT21] Non-destructive techniques applied to stone cultural heritage

[HTT21-02] TLS measurement data and 3D printing of an artificial cave for geotechnical and educational applications

*Yuichi S. Hayakawa^1,2, Takuro Ogura^4,5, Yasuhiko Tamura², Chiaki T. Oguchi³, Kisara Shimizu³ (1.Faculty of Environmental Earth Science, Hokkaido University, 2.Center for Spatial Information Science, The University of Tokyo, 3.Saitama University, 4.Graduate School of Frontier Science, The University of Tokyo, 5.Graduate School of Environmental Science, Hokkaido University)

Keywords:terrestrial laser scanning, point cloud, 3D printing, outreach, underground cultural heritage

Conservation of an underground cultural heritage is often a controversial issue due partly to its invisibility and insufficient awareness in the local society. Also, the safety assessment is necessary to promote sustainable protection of an underground cultural heritage. The developments in high-definition topographic measurements enable to acquire detailed three-dimensional morphological data of a cave, which can be further utilized for the visualization and structural analyses. Regarding the measurements and visualization, we present a case study at the Taya Cave, a registered cultural heritage in Yokohama City, Kanagawa Prefecture in central Japan. The terrestrial laser scanning was performed from multiple scan positions throughout the cave, and the point clouds were registered using the feature-based iterated closest point algorithm. The registered point clouds were then converted into a mesh model, to which face error corrections and a solid filling were applied. After these processes, the mesh model can be printed out in three dimensions. The 3D print model of the cave is used for the class teaching in an elementary school in the local area, and such the visualization of the cave successfully enhanced the recognition by students regarding the underground cultural heritage. The 3D data can also be utilized for the structural assessment of the cave. Effective and sustainable protection of the cave will further be possible by integrating such geotechnical assessments and outreach activities in the local society.