The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part Bl. Beijing 2008 
274 
No. 
Diameter 
breast 
height/ 
cm ( D ) 
Tree 
height/ 
m 
(H) 
Diameter 
breast 
height/ 
cm ( D ) 
Tree 
height/ 
m ( H ) 
Diameter 
breast 
height/ % 
Tree 
height 
/% 
Scanned 
volume/ 
m 
iVp 
Real 
volume/ 
3 
m 
> 
Difference 
/% 
1 
4.20 
4.93 
4.1 
5.10 
2.44 
-3.33 
0.0049 
0.0046 
6.68 
2 
7.45 
6.74 
7.3 
6.83 
2.05 
-1.32 
0.0140 
0.0135 
3.57 
3 
12.40 
9.72 
12 
9.47 
3.33 
2.64 
0.0618 
0.0646 
-4.51 
4 
15.75 
16.55 
16.2 
17.14 
-2.78 
-3.44 
0.1740 
0.1655 
4.91 
5 
17.25 
16.07 
16.7 
16.35 
3.29 
-1.71 
0.1993 
0.1907 
4.31 
6 
18.80 
13.71 
18.3 
14.22 
2.73 
-3.59 
0.1822 
0.1931 
-5.97 
7 
20.85 
14.12 
20.4 
13.79 
2.21 
2.39 
0.2294 
0.2406 
-4.89 
8 
21.40 
11.74 
21.5 
12.06 
-0.47 
-2.65 
0.1975 
0.2027 
-2.63 
9 
22.80 
20.02 
23.2 
20.43 
-1.72 
-2.01 
0.4234 
0.4125 
2.57 
10 
24.05 
17.26 
23.8 
16.84 
1.05 
2.49 
0.3904 
0.3784 
3.07 
11 
24.85 
16.43 
24.2 
16.03 
2.69 
2.50 
0.3328 
0.3476 
-4.45 
12 
28.80 
14.26 
28.3 
14.78 
1.77 
-3.52 
0.3776 
0.3940 
-4.34 
13 
29.20 
19.61 
29.7 
18.92 
-1.68 
3.65 
0.6924 
0.7064 
-2.02 
14 
34.25 
18.65 
35.2 
19.17 
-2.70 
-2.71 
0.6919 
0.7253 
-4.83 
15 
38.00 
19.76 
39.5 
20.56 
-3.80 
-3.89 
0.9197 
1.0060 
-9.38 
Table 1 Comparison scanning data and experimental data (ZHENG De-hua etc., 2005) 
4. CONCLUTION AND DISCUSSION 
(1) The tree stereo model can be acquired by using 3-D laser 
scanning imaging system. Therefore, the accurate measurement 
factors can be obtained, including some factors difficult to get 
by traditional method, like the exterior area and volume of 
stand crown. 
(2) Through analysis, 3-D laser scanning imaging system is 
proved to be a new thoughts and method, which can replace the 
traditional manual measurement method. This new method is a 
supplement and improvement on the current method and its 
precision can meet the requirement of the precision forestry 
investigation. 
(3) The data acquired by 3-D laser scanning imaging system is 
all digital product, which is easy to be preserved, processed and 
set up the data base. All these are easy to be put it into the 
digital forestry system. 
(4) When using the 3-D laser scanning imaging system to 
acquire the measurement factors, this method will not do any 
damage to trees themselves, which is easy to do the continual 
observation and do the research on the forest dynamic 
monitoring. 
(5) Using the 3-D laser scanning imaging system to measure the 
volume of standing trees provides a new thoughts and method 
for the measurement of factors and volume in the open forests, 
which is of great significance and meaning to the monitoring 
trees with efficiency and accuracy, but without damage. 
(6) There are many elements affecting the scanning accuracy. 
For example, the scanning is badly affected by the shading of 
the crown and the surrounding trees, which will make part of 
data not very good. So, there exist certain problems of using 3- 
D laser scanning imaging system technique under the 
condition of the severe crown shading. However, this 
technique can better solve the measurement of standing trees 
volume in the open forest. 
REFERENCES 
FENG Zhong ke, LUO Xu, SHI Li ping. 2005, Some Problems 
and Perfect Approaches of Research on Forest Biomass. World 
Forestry Research, 18(3), pp. 25-28 
FAN Hai ying etc. 2004, Research on Engineering Application 
of Cyra 3D Laser Scanning System. Mine Surveying, (3), pp. 
16-18 
CHEN Jing,LI Qing-quan, LI Bi-jun. 2001, Application 
Research on Laser—Scanning Surveying System. Engineering 
of Surveying and Mapping, 10(1), pp. 49-52 
MA Li-guang. 2005, Classification and Application of 
Terrestrial Laser Scanners. Geospatial Information, 3(3) , 
pp.60 —62 
ZHENG De hua, SHEN Yun-zhong,LIU Chun. 2005, 3D laser 
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Engineering of Surveying and Mapping, 14(2), pp. 31-34