FL 
properties and 
with a remote 
ata collection. 
d its damage 
system with a 
ind enables us 
ation purpose, 
il engineering 
the utilization 
der to manage 
] a visualized 
| in which can 
it system was 
gies and their 
ch as 3D laser 
  
945 A single 
that time the 
? wrought by 
ge since 1996. 
2. SYSTEM COMPOSITION 
The three-dimensional GIS (geographic information system) 
approach is adopted in this system. The system is possible to do 
integrated management of various kinds of measurement 
information at the same spatial coordinate system. The system 
is composed by photogrammetry, coordinates management 
system, ortho-image and 3D laser measurement. (Figure-2) 
  
Photogrammetry 
  
  
  
   
  
Drawing 
and 
Measurement 
    
The coordinates management system 
  
  
  
  
  
   
  
Ortho-image 
  
  
  
   
  
3-dimensional 
visualization 
  
  
3D laser measurement 
  
  
   
  
Figure 2. System Composition 
3. PHOTOGRAMMETRY 
The process of the image editing work of photogrammetry 
results, the coordinates management system that calculates 
coordinates values, and the validity of ortho-image, are 
introduced. 
3.1 Drawing Measurement 
Mostly, the Atomic bomb memorial dome's walls are curved 
surfaces as shown in Figure-3. The south-north walls have an 
angle of about 5 degrees to the baseline of the west-east walls. 
The 3-dimensional data of each part were obtained using the 
Digital Photogrammetric Workstation. Then, elevation and 
sectional views were drawn by comparing their 3-dimensional 
isometrical figures. To draw each wall's surface most faithfully, 
photography and drawing works were done from the orthogonal 
direction for each wall (baseline). (Figure-4) The cross- 
sectional positions that can display all the inner walls of the A- 
bomb memorial dome were set up, and some sectional views 
were drawn. The data of the dome were collected by the 
engineers who are skilled in coordinates capturing of three- 
dimensional shape, such as brick, by reproducing of 
stereographs in the Digital Photogrammetric Workstation. The 
three-dimensional model of the dome was conducted in the 
computer. When reading a photograph, the data were classified 
into the layer (layer classification) by the difference in material 
or situation shown below for data management. 
Material: concrete, brick, mortar, steel, etc. 
Situation: repaired part, crack, exfoliation, etc. : 
The coordinates data of each wall surface read from every 
drawing area was transformed into a global coordinate system, 
and junction adjustment data was performed  three- 
dimensionally. 
N = 
  
  
  
  
  
Figure 5. The sectional views (A-A") 
—435— 
  
sense