ABSTRACT
This paper discusses some 3D data model problems in Mine GIS. First, the status quo of GIS used in mines and mainly 3D data model are looked back. Then, the authors give some thoughts about 3D data model in mine GIS. (1) Mine GIS model should be built on geology model. (2) Oriented-object vector model may have more advantages in mine application. (3) complicated curve surface representation in 3D GIS. (4) 3D triangulate along curve surface is discussed to express nearly vertical or overturn fold curve surface. The procedure is (a) by manual interfering to divide sub-surface, (b) in every sub-surface, substitute 3D distance for 2D distance in Delaunay triangulating. The paper also discusses about nonuniformity of volume object interior. The authors think that 3D linear function and 3D ternary cubic function could be used as volume interpolation function.
