Abstract: 3D data structure is the focus in 3D GIS research. 3D grid data structure has gained wide application in fields such as digital image, digital elevation model, etc. The paper studies the 3D grid data structure from the aspects of grid coding, its spatial analysis, etc. It is exemplified by the study of a real deposit, which involves the techniques and method used for the spatial analysis by 3D grid data structure in the ore block modeling, reserve estimation in specified area, etc. Suggestions and prospect are also made for the future study and application of 3D data structure.

Key words:  GIS, 3D gird data model, spatial analysis, Block modeling, Ore reserves estimation