3.2.2 Work process: In February 2003, the authors made 
laser scanning (using Cyrax2500) of Dock No. 1, located on the 
eastern coast of Uraga Bay, the two giant cranes at the side of 
the dock, and the former head office (Fig.4). Maximum laser 
measurement was performed from the ground level for the given 
two day period of time. Dock No. 1 and the whole peripheral 
facilities were scanned. 
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Fig. 4 Dock No. 1 
3.2.3 Application: Not all historic structures can be 
preserved, and there are many that are lost due to various 
reasons. Digitised 3D data created by laser scanning the Dock 
No. 1 area were used to compile the history of Yokosuka City 
(Fig.5). It is very important to record such structures in the best 
possible ways, to preserve the heritage for future generations as 
a part of the town's memories. In this case the laser scanning, 
which had an advantage of speed and accuracy, proved very 
effective. 
    
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Fig.5 3D Data of Dock No. 1 
3.3 Creating 2D Drawings (The Traveler's Beacon in 
Fukaya City) 
3.3.1 Purpose: The Traveler's Beacon in Fukaya City, 
approximately 4 meters high, was built in 1840 (Fig.6). This 
monument is made of stone but is aging, raising concerns of 
wear, damage or even collapse with earthquake or typhoon. 
Blueprint of these historic lantern is necessary as reference 
material to conduct repair, however, accurate drawings are no 
longer found today. For this purpose, the authors tried to create 
drawings from the 3D data acquired by laser scanning. 
3.3.2 Work process: Laser scanning (using VIVID900) was 
completed in one day using the height work vehicle. Processing 
data and creation of the 3D model took a total of four days. 
As the obtained 3D data can be displayed and viewed from any 
angle, orthogonal and perspective views are easily available. 
But it is impossible to extract and draw edges of component 
joints or uneven surfaces automatically and correctly. 
  
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B5. Istanbul 2004 
Therefore, the 3D data obtained by laser scanning was displayed 
from orthogonal view, and after picturizing it, the method of 
tracing with CAD software was performed (Fig. 7,8). 
Judgement of displayed lines on the 3D model, whether they are 
joint lines of components, cracks or surface patterns, also 
proved difficult. Therefore, the parts with difficult recognition 
were drawn referring to the photograph. 
  
Fig.8 Drawings of the Traveler's Beacon 
3.3.3 Results: Manual measurement is inferior to the laser 
scanning in terms of speed and accuracy. However, manual 
measurement and drawings made by specialists sometimes 
becomes inevitable information, depending on who made them 
for what purpose. In most cases the purpose of laser scanning is 
to generate 3D data, and not to make 2D drawings. Therefore, 
in order to meet this purpose of creating 2D drawings, the high 
accuracy and speed of laser scanning technique may be effective, 
yet not enough. It is important to increase the reliability of 
drawings based on advantages of both laser scanning and 
manual methods. 
   
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