50 
ISPRS, Vol.34, Part 2W2, “Dynamic and Multi-Dimensional GIS”, Bangkok, May 23-25, 2001_ 
vm 
■—s — 
Scene Operator 30 Operator Flying Operator Query About System 
_d 
« r—. — *’ w f~“; 
Fig.6: Web 3D City Scene (Client-side) 
5 CONCLUSIONS AND FUTURE RESEARCH 
The creating of city models is necessary for visualization 3D 
city data of high fidelity on Internet, at the same time, storing of 
large amount of spatial data and attribute data also is of vital 
importance. The 3D city model is very useful in many fields 
(landscape analysis, urban planning etc). Interactive operation 
via Internet about building model such as querying buildings, 
SQL analysis about some buildings in the area, and so on, is 
indispensable. In this paper, some researches about 
visualization 3D geographic data and constructing 3D building 
model are introduced. A system prototype (CWeb3D) for 
visualization 3D-city model on Internet is developed and 
several conclusions are drawn as follows: 
• LC model is developed to construct complex 
buildings, which not only can be used to construct 
Internet 3D building model, but also can be suited to 
interactive operation on Internet including query and SQL 
analysis. 
• Interactive operation on Internet about building 
model on server side, such as create, query, mapping 
textures, and so on, can be fulfilled in this system. 
• A data organization for storing building model is 
implemented for the requirements of visualization, 
interactive operation such as visualization, query, 
mapping textures, and so on. 
• A system prototype (CWeb3D) for 3D-city model 
on Internet is developed which includes 3D visualization 
and operation about querying 3D objects and some query 
analysis. 
For future research, considering the speed of operating the 3D 
city scene on client-side, mapping textures on the building 
model also needs to improve. The main buildings that are 
important to show 3D city scene need to map textures. And 
using colors instead of textures to display other buildings, all 
this will speed up the 3D city scene operation. The deep 
research about the spatial analysis, such as shortcut analysis, 
is needed 
ACKNOWLEDGEMENTS: 
The work described in this paper was substantially by a grant 
from China National Natural Science Funds (No.69833010). 
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Alexander Koninger, 1998. 3D-GIS for purposes. 
Geoinformations, 2:1,pp, 79-103. 
Bisheng Yang, Qingquan Li, Deren Li, 1999. Building Modeling 
for 3D City Model. Geo-spatial In-formation Science, Vol.2.No.1, 
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