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Figure 6. The VRoad expressed by transect-based road model 
5. CONCLUSION 
The road three-dimensional model is important to express the 
road, and choosing a good road model is the key of a system 
construction. The transect-based road model is put forward to 
express what the modelling of road elements demand, but there 
are many questions need to be resolved, such as how to make a 
integration of the road models with terrain, and how to resolve 
the large volume data. 
* ^ ACKNOWLEDGEMENT 
The work described in this paper is supported by the grants 
from HuBei Province Technology Project of Tackle Key 
Problem (No. 2001AA104A01) and the grants from JiLin 
Province Academy of Road Surveying and Design. The authors 
appreciate Mr. Li Changjiang, Mr. Liu Xianhui, Mr. Zhang 
Cheng, Mr. Chen Jiaging, Mr. Wang Chaoyang, Miss Hu Bei, 
Miss Ren Juan, and other colleagues of the JiLin Province 
Academy of Road Surveying and Design. 
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