3D city model is playing an increasingly important role in in our society and people's daily life, such as navigation, urban planning, disaster management etc. Therefore, many cities and companies start to generate their own 3D city models both manually and automatically. Along with the enrichment of 3D city data, it is essential to be able to integrate data from different sources and deliver the 3D city scenes to users quickly and easily. The objective of this research is to develop a framework to suppo rt online visualization of 3D city models. In the proposed framework 3D city data is stored in CityGML format on server side, then the models is converted into 3D scenes in X3D and transmit to the user side using AJAX. Finally, the 3D scenes are visualized in the user browser using X3DOM method.
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