The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part Bl. Beijing 2008 
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laser scanner is feasible. The simulated test proves that it can 
satisfy the needs in large range of the landslide. 
Pts within +/-(2 * StdDev) 
12534 (98.97%) 
Pts within +/-(3 * StdDev) 
12575 (99.29%) 
Figure 8: Colored vectors attached to an object along the 
direction of the landslide 
(the first is a profile display, the second is a face display) 
3.2The accuracy of the test result 
In this test, it not only verifies the feasibility to monitor the 
landslide but also receives the system errors of ILRIS-3D 
based-ground laser scanner. The test method is explained in 
2.3. The tested person moved about 1 meter along the direction 
of the landslide in Y axis. It should remove the points of the 
tested people and filter other noise points. At last, the point 
cloud is all bare-earth points, and then compare to the twi- 
scanned datum. The accuracy of the test result is listed in the 
table3. 
Points 
12665 
Mean 
0.001105 
StdDev 
0.000997 
RMS Error 
0.000137 
Pts within +/-(1 * StdDev) 
12214(96.44%) 
Table 3: the report of the accuracy (Unit: meter) 
4. CONCLUSION 
According to this experiment, we can draw the following basic 
conclusion: 
(1) Theoretically, we should carry on the long-term 
observation to the mountain massif landslides. Then we 
can analyze the tendency of the mountain massif 
landslides from these long-term observation data and 
carry on the effective monitor and the prevention. But the 
price of this way in the manpower, the physical resource, 
the financial resource and the time is quite high, therefore, 
this paper designs this method of simulate mountain 
massif landslide to carry on the monitor. The test result 
proves that the way might achieve the quite accurate goal 
in monitoring the landslides. 
(2) The test result proves that the way of using the ground- 
based 3D laser scanner to carry on the mountain massif 
landslide monitoring is effective. In this test method of 
the paper, we may achieve 3~5 mm precision. 
(3) This way does not need to establish the vast station to 
observe. By contraries, the methods of the GPS, the 
geodetic survey or other “point” monitoring need to more 
station to observe. The method can gain the “surface point 
cloud” information about the region of the landslide very 
fast, thus we may monitor the mountain massif landslide 
effectively and analyze the dynamic change tendency of 
mountain massif landslide. At the same time, we may 
return to the original state of these mountain massif 
surfaces according to “point cloud” data and carry on the 
3D surveying on the surface. 
(4) The ground-based 3D laser scanner is a technique of non- 
contact and active remote sensing. This system can 
provide the colorful images and deploy by a single 
operator. The work efficiency is high and the surveyor 
does not need to arrive at the dangerous region to set up 
the GPS stations or the prism spots. 
5. FORCAST 
(1) This test was only designed one simulated landslide goal. 
We will consider to setting up more stations in the 
landslide region in the future, thus we might analyze the 
landslide fully and effectively. 
(2) Because of the funds and time, this experiment only 
scanned twice to monitor the simulation landslide. In the 
future we should carry on the long-term observation in 
the different stations in order to achieve the goal of 
dynamic monitoring. 
(3) This system used in the landslide monitor is restricted by 
the following factors: the available range of system, 
atmospheric refraction, the reflectivity of the targets and 
the penetration coefficient of systemic laser and so on. 
The available range influences the precision, density and 
reflectivity of the point cloud and so on. If the weather 
situation is well and the observational distance is not very 
far, the influence of the atmospheric refraction is not big. 
The coefficient of main reflection is decided by the type