2Y Takase, A Sone, T Hatanaka, M Shiroki, T Masumi. A development of 3D urban information system on web [ C ]. Processing and Visualization using High - Resolution Images. Thailand, 2004.
3D Jurgen, B Henrik. Continuous level - of - detial modeling of buildings in 3D city models[ C]. Proceedings of the 13th annual acm international workshop on geographic information systems. Bermem:ACM Press, 2005. 173 - 181.
4Gavin S P Millier. The definition and rendering of terrain maps [J]. Computer Graphics. 1986,20(4) : 39 -48.