Three-dimensional Visualization Modeling For Gravity And Magnetic Field

Three-dimensional visualization is an effective way to display the effect of geological structures, by which the information of mineral resources can be reflected. The three-dimensional visualization of potential field can provide geophysical researchers with a much more direct-viewing approach to appreciate the implication of large numbers of collected data, which can not be revealed by numerical information. In this thesis, three-dimensional modeling of geologic bodies and corresponding potential fields as well as human-computer interaction techniques are studied for providing researchers with a direct-viewing tool for data interpretation and examination.The main object of this thesis is to visualize the models of homogeneous and regular three-dimensional geologic bodies and corresponding potential fields derived from forward modeling. There are mainly three kind of regular three-dimensional geologic bodies, such as spherical bodies, finite inclined plates and finite horizontal/inclined cylindrical bodies. In this thesis, the models of assembled three dimensional bodies are also studied to describe much more complex geological conditions. These results are helpful in interpreting the anomalies induced by multiple sources. Furthermore, modeling of irregular geologic bodies is discussed in the thesis. Relevant formulas are deducted and modeling schemes are proposed for further studies.Human-computer interaction herein refers to modifying the parameters of geometry and physical properties of geological models through input device and then calculating and displaying their potential fields. This technique makes it possible to observe the real-time variation of potential field while geological model is changed. According to the displayed results and the collected data, geological researchers is able to approximately identify real ore bodies underground through such a kind of forward modeling.In the soft wares such as Surfer and MATLAB, three-dimensional data visualization is available. However, these soft wares can not provide the function for real-time calculation of the magnetic and gravity fields through constructing and modifying geological models. This limitation splits the whole research into two different parts including model construction as well as potential field calculation and visualization. The asynchronization between these two parts of work decreases the efficiency of research. In this thesis, the functions of model construction as well as potential field calculation and visualization are integrated together to raise the efficiency of data processing and interpretation.In this thesis, all the functions are developed by using C# language on .NET platform within which CsGL graphic development kit is used to replace OpenGL to realize corresponding functions. Experimental applications suggest that the software can be effectively used for three-dimensional geological model construction as well as potential field calculation and visualization.