The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part Bl. Beijing 2008 
412 
(1) Test of data quality 
We scanned the wall of a building using the portable 3D laser 
scanner (figure 5(a)). Seen from the enlarged part, the laser 
sampling points are distributed in order, and there are few jump 
points on the wall plane. It shows the data quality is very good. 
Figure 5(b) is the 3D point cloud of our researching room. We 
can see the door, the windows, the cabinets, the desks, the 
chairs, the clock on the wall, and the lamps on the floor clearly. 
The edges of objects are also seen clearly. 
(2) Test of optimal measurement range 
The max measurement range is 80m, but the optimal 
measurement range is from 0.2m to 40m. While we captured 3D 
data of outdoor scenes, we found out that the objects within 
about 40m from the laser scanner to objects are described as 
detailed as shape information, for example, figure 6. It is 
suitable for acquiring 3D data of long galleries and tunnels. We 
collected 3D data of the prayer-wheel gallery of Jokhang 
Temple using the 3D laser scanner to (figure 7). 
(a) Plane test 
(b) Edge test 
Figure 5. Test of quality data 
Figure 6. Test of optimal measurement range