Three-dimensional Digital Documentation and Accuracy Analysis of the Choijin Lama Temple in Mongolia

Abstract

The Choijin Lama Temple is a representative example of 19th-to 20th-century architecture. The temple has been damaged by various development pressures and the effect of a harsh continental climate. This study digitalized the entire temple site using three-dimensional scanning to establish the basic data of conservational management and monitoring for spatial changes. A terrestrial laser scanning model of the temple was completed, which showed low registering error vectors (3.73 mm average) and dense point distances. Unmanned aerial vehicle (UAV) photogrammetry was also applied to verify its applicability to the spatial and environmental monitoring of the temple. The results showed that the overall point density of the UAV photogrammetry model is similar within a 10 mm resolution. The relatively low RMSE of UAV photogrammetry from the ground to the uppermost roof indicates the high applicability of integrating it with the terrestrial laser scanning model. The digital documentation of the Choijin Lama Temple is expected to have a great ripple effect on the documentation, conservation, and utilization of Mongolian cultural heritage sites.

Convergence Modeling and Reproduction of a Bigyeokjincheolloe (Bomb Shell) Based on Three-dimensional Scanning and γ-ray Radiography

“…Convergence modeling using terrestrial laser scanning + unmanned aerial photogrammetry and optical surface scanning + X-ray computed tomography has already been reported in many studies (Fawzy, 2019;Lee, 2019;Jo et al, 2020b;Shimizu et al, 2022).…”

Three-dimensional deviation analysis and digital visualization of shape change before and after conservation treatment of historic kiln site

“…In particular, in the case of poorly cultural heritage sites, multiple treatments and restorations were performed in some cases [11]. Records form the crucial component of monitoring conservation conditions, and digitized records obtained using advanced equipment are gradually being increasingly used instead of the existing handwritten documents [12][13][14][15][16].…”

“…The 3D scan was performed at a rate of about 16 frames per second in an environment without direct sunlight because it was necessary to distinguish the structured light scanned on the kiln. The scan data acquired in the eld basically undergo almost the same process as the midrange scanning data, but they are different in that the former data were obtained in the form of a polygon mesh rather than as point cloud data [7]. In particular, the mid-precision scanning results were of excellent quality in terms of both the polygon mesh and RGB texture mapping results.…”

Cultural Heritage Image Analysis and Support Modeling Using X-ray Computed Tomography: Focused on the Byeongsan Mask ‘Eul’ of the Hahoe Masks and Byeongsan Masks of Andong

“…Front and Back view of Byeongsan Mask 'Eul' before conservation processing. al., 2021).방사선을 이용하여 문화유산 형상을 기록하고 분석하는 것의 장점은 광학식 표면 스캐닝의 한계인 사각지대에 대해서도 형상 획득이 가능하다는 것이다(Jo and Hong, 2019b;Jo et al, 2019;Jo et al, 2020b). 따라서 연구대상인병산탈을 X선 CT 촬영 조건 50㎸, 750㎂에서 촬영하여 비파괴적으로 내부 상태 및 보강재와 탈 사이의 좁은 틈, 탈에 존재하는 구멍 내부까지 단층영상과 3차원 형상을 모두 획득하였다(Table 1).…”