An Integrated Data Model in Three Dimensional GIS

Usually current GIS can only deal with 2-D or 2.5-D information on the Earth's surface.A new 3-D data structure and data model need to be designed for the 3-D GIS.This paper analyzes diverse 3-D spatial phenomena from mine and geology and their complicated relations,proposes several new kinds of spatial objects including cross-section,column body and digital surface model to represent some special spatial phenomena like tunnels and irregular surfaces of ore body.An integrated data structure including vector and raster data and object-oriented data model is used to represent various 3-D spatial objects and their relations.The integrated data structure and object-oriented data model can be as a fundament to design and realize a three dimensional geographic information system.