3D city model is the hot topic discussed all over. With the growing demand, TreisTek has stepped into it as one of the pioneers. TreisTek represents 3D city models in 2 kinds: Photo realistic representation and Symbolic representation. A PHOTO-REALISTIC 3D CITY MODEL Photo-realistic 3D city model is a computerized model of a city. We use these models to give the user a picture of the city as it appears. In a photo-realistic environment, the user may take a virtual city tour t