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function. 
The authors also think that the Object-Oriented model 
has advantage, especially Object-Oriented vector model 
has great advantage in geology and mine. 
2.5 INTEGRATION OF DIFFERENT DATA MODEL 
Because of the complexity of 3D world and the 
multiformity of 3D application, it results in variety of 3D 
data model. None of 3D data model can suit for all 
domains and all applications ideally. Different data model 
has itself advantage and disadvantage. Integration of 
different data is reckoned as promising development way. 
Li & Li (1997 ) Proposed three type integration of 3D data 
model, namely, (1)TIN with CSG, (2) Octree with 
tetrahedron and (3)vector with raster. Object-oriented 
model of Gong (1998) also emphasize on integration of 
vector and raster. 
3 SOME THINK ABOUT DATA MODEL IN MINE GIS 
3.1 MULTIFORMITY AND COMPLEXITY OF MINE WORLD'S 
SPATIAL GEOGRAPHY PHENOMENON 
A mine GIS data model is abstract to the mine world. The 
spatial object and phenomenon in mine world is very 
multiformity and complicated. It includes natural objects, 
artificial constructions and human activity. The nature 
objects include ground surface, rocks, ores, faults and 
folds. The artificial constructions include overground 
buildings, underground well laneways, pipelines and 
machines. The dynamic process includes wind flow, 
power flow, material flow, human flow and information 
flow. Mine GIS data model is one of the most complex 
models in GIS. Mine GIS data model should be 
constructed on the base of mine geology model. 
3.2 ADAPTABILITY OF DIFFERENT 3D DATA MODEL IN MINE 
GIS 
Guo(1992,1 996), Du(1998), Wu(1998) have research in 
different data model in mine GIS. They also think that 
none onefold data model can completely satisfy with 
application in mine. So the integration and hybrid of 
different data model should be development direction of 
mine GIS. The author thinks that object oriented vector 
data model possession more advantage in mine, geology 
application. Object oriented vector data model abstract 
real world to aggregation of 3D point object, line object, 
surface object and volume object. For example, reservoir, 
rock, ore, laneway can be abstracted as volume object. 
Ground surface, fault and rock layer surface can be 
abstracted as surface object. Pipeline can be abstracted 
as line object. Device, worker, can be abstracted as point 
object. Obviously, the classing for object type changed 
with size of object, dimension of expression and 
application theme. For example, a real fault rarely is a 
surface, in most case is a fault band, accurately, should 
be a fault “layer body”, on fault band (layer), cracked rock, 
fault breccias and the ingredient of fault are very complex. 
The width (thickness) of fault band (layer) changed very 
much. In small or middle scale, fault can be abstracted as 
a surface object. In large scale, the fault may be 
abstracted as body. Another example is laneway, in 
material flow analysis of underground, can be abstracted 
as line object, in large-scale displaying underground 
shape, it may be abstracted as body object. One object is 
expressed as different type in different dimension and 
different application. 
3.3 SURFACE EXPRESS IN MINE 3D MODEL 
3D surface express is a key in 3D GIS data model. On the 
one hand, it is spatial express about 3D spatial surface 
object such as ground surface, rock interface and fault 
surface. On the other hand, it is boundary of body such as 
rock body, ore body. So, spatial description of 3D surface 
takes a very important position in 3D GIS software 
realization. 
TIN (Triangle Irregular Net) is general way of expressing 
3D surface in 2.5D GIS. It is projecting random sampling 
points of surface to horizontal plane, then triangulation to 
build TIN. The application condition is that shape of 
surface is simple, cannot be near vertical or overturn. But 
in mine application, it is often need to deal with near 
vertical or overturn surface. In this case, the traditional 
2D triangulation is unworkable. It is need to search new 
method. The author (1999) think that 3D triangulation 
along surface may be an effect way. Curve surface 3D 
triangulation is an important way of surface rebuilding in 
3D CAD and 3D CAGD. It has many research works, but 
still has many especially difficulties need to be solved in 
application in mine. There are many especially restriction 
conditions can be used. 
3.3.1 3D TRIANGULATION TO COMPLICATED SURFACE 
It can be proven that for random sampling points in 
complicated geology surface, showing as Fig5, automatic 
3D triangulation way is not existed. But we can use some 
particularly characters of original data (such as rock’s 
incline direction, incline angle in geology drill and the 
general geotectonic direction of the region). Referring the 
method of geologist making geology profile, adding some 
human interfering, it is possible to perform 3D 
triangulation to complicated surface. Generally, there is a 
main geotectonic direction in a region. Geological 
exploration sampling lines are generally perpendicular to 
main geotectonic direction. In the exploration sampling 
line, the distances of sampling points are shorter than 
other direction. The geologists especially attend to profile 
of exploration lines. When they analyze one profile, they 
consult adjacent profile. This traditional procedure can 
be used for reference in 3D triangulation of geology 
surface. 
3.3.2 SUB-SURFACE DIVIDED OF COMPLICATED GEOLOGY 
SURFACE 
A complicated surface is that fold limb overturn or is cut 
by fault, so it is needed to partition different sub-surface