3D DIGITAL MODELING OF MODERN TIMES BUILDING FOR PRESERVATION 
AND RESTORATION 
W.J. Oh**, S.H. Han”, H.C. Yoon*, Y.S. Bae 3 S.H. Song 
“Dept. of Land Information Management, ChungCheong University, wjoh@ok.ac.kr 
"Dept. of Civil Engineering Cheonan Nat'l Tech. College, shehan@cntc.ac.kr 
‘Dept. of Civil Engineering Ansan Tech. College, yoonhc60@ansantc.ac.kr 
"Dept. of Civil & Environmental Systems, ChungCheong University, baeys(@ok.ac.kr 
“Dept. of Civil Engineering, Juseong College, shsong@jsc.ac.kr 
Commission V, WG V/4 
Key words : ortho-image, digital image, photogrammetry, 3D digital data 
Abstract: 
This study aim is the establishing the 3D digital data of cultural architecture by applying the digital photogrammetric technique. I 
would applied as the basic data for preservation and restoration of cultural assets by suggesting the direction of establishing 3D 
digital data and the more accurate measurement methods than before lagged ones. And I could establish the useful data for visual 
analysis by connecting the ortho-image which was made by digital image for the object and the vector data which was acquired by 
plotting. The establishment of precise 3D information by photogrammetry was possible, so the application of photogrammetry for 
measuring various cultural assets which require precise measurement is expected actively in near future. 
1. INTRODUCTION 
Measuring cultural assets requires precise measurement data 
for preservation and restoration and also precise interpretation 
by non-contact method without damaging cultural assets. 
Recently measured data needs to be 3D digital data not existing 
2D drawing data. These digital data can be used in extensive 
areas and be modified, supplemented and permanently 
preserved so that they are preferentially requested in 
preservation method planning for cultural assets. However, 
drawings prepared by existing measurement methods for 
cultural assets are not satisfactory in terms of accuracy and 
need additional works to convert drawings to digital data. 
Thus, this study aims to examine applicability of digital 
photogrammetry by applying photogrammetric techniques and 
analyzing space in various ways using acquired digital data for 
more precise and effective acquisition of 3D digital data for 
cultural assets. To this end,the main building of Korea 
University, the large architecture designated and maintained as 
the historical relic’s No. 285, was selected as the subject. Then, 
digital images of the subject have are obtained by accurate plan 
to take pictures so that digital data from digital images and 
reference point measurement performances required for 3D 
image interpretation will be generated. Moreover, 3D digital 
drawings on the front side of the subject are prepared using 
obtained digital data so that this study will suggest efficiency in 
digital photogrammetry in acquiring effective basic data for 
maintenance, management and restoration of large cultural 
assets. Furthermore, this study will present convenience of 
digital photogrammetry for restoration of cultural assets on the 
basis of dimensional digital data as generating still images from 
digital images and carrying out 3D modeling for the subject. 
Figure | illustrates the research process mentioned above. 
Coordinates of reference points required for 3D image 
analysis were acquired using Mono Mobile 3-D Station and 
coordinates for reference points on different sides were ob 
tained using the same coordinate system. 
62 photography points were selected for analyzing all planes 
of an object and analysis planes were classified into 25 
  
Planning of 
Photogrammetric 
AN Ca TEN A ct 
Define 3D coord. 
system : 
F 
  
  
  
    
  
  
  
  
Y 
Photographing using 
Metric camera 
    
  
  
  
  
Control Surveying 
  
  
Film Scanning E 
     
  
  
  
Y 
Mapping by DPW(VirtuoZo) 
*Lens Calibration 
*Product Stereo Model 
*Mapping using stereo viewing 
*3D digital data acquisition : 
Model Combination |. 
3D Map i 
Ortho Mosaic Map 1 
Data acquisition for 
Preservation and Restoration | 
FCAT 
  
  
  
  
  
    
    
    
    
  
  
  
  
Figure 1 Research Flow Chart 
sectors and planned to form total 36 models. Those exposure 
stations were determined with respect to the size of an object, 
angle of view of a camera, surrounding conditions of an object 
and expression of detailed patterns. Conditions on each 
exposure stations were planned as shown in Figure 2 and 
dimensional images were acquired. Figure 2 describes 62 
     
  
  
  
   
  
  
  
  
  
  
  
  
  
  
   
  
   
  
  
  
   
  
   
   
   
     
  
   
      
   
  
   
  
   
    
   
  
   
   
  
  
  
  
  
   
  
   
  
  
  
   
  
   
   
   
   
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