Research And Implementation On The Core Technology Of 3D Geological Survey Software

Geological survey software can assist the geologists to build three-dimensional data model in computer, which can work in ore deposit simulation, mine assessment, design planning, mine management, etc. As early as 1970s, this kind of software has been developed in foreign country. However, we have no mature geological survey software now. Therefore, we have been developing this three dimensional mine survey software in the last five years, which we call it "TanKuangZhe"(MinESoft). During the developing, we came up with new concept "Geology Information System", and added two-dimensional module in three-dimensional system. Combining computer information technology with geosciences, we implements geology three-dimensional visualization.MinESoft is based on Windows platform, compiled with VS Studio 2005(VC++ language), rendered in OpenGL library. All algorithms are developed ourselves. As my part, I took part in this software developing from August 2005 until now. The module I have finished are as follows, "Two-Dimensional Symbol Editor", "Two-Dimensional Vector Editor"(Includes topology and attribute library), "3DEM Three-Dimensional Modeling"(Includes demarcating single engineering mine, section editor, three-dimensional reconstruction), "Three-dimensional spatial analysis", "Reserves estimation"(Includes geological ore block method, geological cross section method). Furthermore, I have designed and implement two data structure, one is used in two-dimensional called "Extended FTR two dimension topology data structure", the other is used in three-dimensional called "T-Rep topology data structure".Firstly, Extended FTR two-dimensional topology data structure and its attribute library will be introduced. In this chapter, some techniques will be used in dealing with "suspend arcs", "bridged polygon", "pointed polygon" problems. On that base, T-Rep topology data structure in three-dimensional will be introduced in detail. Then two methods of three-dimensional reconstruction will be imported, which are simulated annealing genetic algorithm and marching prismoid algorithm. As its application, some algorithms will be described. Through read this chapter, the essential part of this software can be acquired.Some innovations are brought forth during this software. First is a concept called compound feature, with an Extended FTR two-dimensional topology data structure. This data structure can solve suspend arcs, bridged polygon, pointed polygon problems. Using B-Rep for reference, T-Rep topology data structure in three-dimensional is raised. T-Rep maintains the integrity of three-dimensional topology; meanwhile, T-Rep simplifies three-dimensional topology complexities. Two methods of three-dimensional reconstruction will be imported, which are simulated annealing genetic algorithm and marching prismoid algorithm. The two algorithms complete each other. One is good at reconstructing complex curve, while the other can solve branching problem. Finally, MinESoft combines three-dimensional visualization and geology completing three-dimensional data module. We can use geological ore block method or geological cross section method to do reserves estimation.