5Breunig M. An approach to the integration of spatial data and systems for a 3D geo- information system[ J]. Computers & Geosciences, 1999, 25( 1 ) : 39 -48.
6Wu Qiang, Xu Hua. An approach to computer modeling and visualization of geological faults in 3D[ J]. Computers and Geosciences. 2003. 29(4): 503- 509.
7Suveg lldikoa, Vosselman Georgea. Reconstruction of 3D building models from aerial images and maps[ J]. ISPRS Journal of Photogrammetry and Remote Sensing, 2004, 58(3 -4) : 202 -224.
8Butler D. Virtual globes: The web-wide world [J]. Nature, 2006, 439: 776-778.
9Gewin V. Mapping opportunities [J]. Nature, 2004, 427:376-377.
10OGC 2010. OpenGIS? City Geography Markup Language (CityGML) Encoding Standard ver- sion 1.0.0, 2010, 08-007r1 [EB/OL].[2010-08-09], http://www.opengeospatial.org/standards/ citygml.