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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B5. Beijing 2008 
scanning was performed by each direction and total 35 scanning 
data(17 up-lines and 18 down-lines) were scanned as moving in 
order for the gap of each scanning data to be about 40m. 
Figure 7. Constituent diagram of laser scanning for registration 
and georeferencing in the object tunnel. 
Figure 9. Panoramic view of a sub-sections 
The data obtained in the process of a sub-project included the 3 
dimensional location information, RGB information and 
reflection powerfulness information and the primitive data of a 
sub-project were appeared like Figure 10 and Table 3. 
No 
X 
Y 
Z 
R 
G 
B 
Intensit 
y 
1 
6.036 
3.203 
-1.715 
158 
181 
144 
25 
2 
9.522 
4.235 
-0.915 
213 
116 
253 
64 
3 
11.265 
3.563 
0.236 
161 
153 
151 
30 
And the ground reference points were facilitated at the starting 
part and the ending to convert the multi scanning data into the 
absolute coordinates. 3 round-type targets were facilitated at the 
repeated location like Figure8 for the conformation of sequent 
multi scanning data and precisely scanned in the process of 
each sub project work. 
object 
a rari 9e 
a ran 96 
• a location of 
© a sohencat target for 
Figure 8. Plan view of spherical target arrangement for the 
registration of continuous scanning data. 
At 2 ground reference points facilitated at each starting point 
and ending point, the round-type targets with the high reflection 
powerfulness were facilitated and the precise scanning was 
performed to achieve the conversion into the absolute 
coordinates. The photograph which automatically mosaicked 
the snap photographies obtained while the laser scanner was 
rounded 360° in the horizontal direction within the concerned 
tunnel is like Figure 9. 
Table 3. Raw point clouds data including various informations 
Figure 10. Illustration of raw point clouds data obtained from a 
sub-sections 
3.2 Results of measurement 
The transmitted data were treated by Real Works Survey 
developed by Trimble company. At the step of treatment, the 
registration and the geo-referencing were performed and finally 
the accuracy of treated data was analyzed. And for the 
registration, 3 round-type targets were facilitated at the repeated 
locations in the process of the sequent sub-project and precisely 
scanned in the process of each sub-project work. The round- 
type targets were facilitated like Figure 11 and the figures of the 
targets precisely scanned at the sequent prior and post sub- 
project are as per Figure 12 and 13.