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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B5. Beijing 2008 
Figure 11. View of arranging spherical target for registration 
to be converted into the absolute coordinates of objects. Figure 
16 shows the result that 17 multi scan data obtained at the up 
line section of the length of 665m were done by registration and 
finally by geo-referencing. 
Figure 12. Continuous point clouds data(before) 
Figure 13. Continuous point clouds data(after) 
From the data of round-type targets precisely scanned, the 
centers of targets are automatically determined like Figure 14 
and as using 3 centers of targets determined like that, the 
relative location conformation among the sequent sub-project is 
achieved. The results of the registration of obtained 3 sequent 
scan data were appeared like Figure 15. 
Figure 14. View of automatically recognizing spherical target 
Figure 15. Result of registration 
Figure 16. Result of georeferencing for a line 
The scan data passing through the final treatment step is used to 
determine the cross sections of tunnel at 1.0m intervals by 
profile/cross-section tool. Firstly, the center line data of road in 
the tunnel are overlapped on the scan data and the point data 
concerned to the cross section with 1.0m gap away from the 
The multi scan data forming the same coordinates series over 
through such data conformation process are combined with 
ground reference points through the process of geo-referencing