【作者】 蔡海军；

【导师】 叶水盛；

【作者基本信息】 东北师范大学 ， 计算机软件与理论， 2006， 硕士

【摘要】 三维地质建模是将科学可视化技术与地学研究特点结合,通过可视化技术的研究,实现面向地学应用的三维GIS,以图形图象形式逼真再现三维地质实体,以便真实重建地下目标的结构,描述资源分布状态,模拟地学应用各种参数的动态变化趋势,分析地质现象的几何形态、相互关系和分布。本文的主要研究目标是将三维地质建模理论应用到重磁正反演中,通过科学可视化技术的研究建立重磁异常三维人机联作反演系统,为三维重磁解译提供直观、形象的三维人机交互工具。本文研究了三维可视化的理论方法,并针对地质体的三维空间特点,对三维地质模型进行了深入探讨,然后利用三维可视化技术将三维地质模型以3D真实感图像的形式表现出来,实现了具有实用价值的重磁异常三维人机联作反演系统,本文主要研究内容有:(1)对三维地质模型进行了深入分析与总结,分别探讨了面模型、体模型和混合模型的特点与不足,指出当前三维地质建模研究中存在的主要问题。(2)采用了面模型对地质体模型进行交互建模,在建模过程中,使用三视图技术解决了三维模型编辑的困难,实现了三视图的联动显示;提出了模型的拓扑和几何修改方法;利用三维跟踪球技术实现了三维模型的旋转,为模型的建立提供了辅助性操作。(3)研究Loop细分算法,利用该细分对地质体进行光滑,使模型的效果更加自然、真实。(4)研究重磁异常正演算法,设计并实现了重磁异常三维人机联作反演系统。更多还原

【Abstract】 Combining scientific visualization with geological characterization, 3D geosciencemodeling (3DGM) is used to develop 3D GIS through visualization technology. The mainstudy object of this thesis is to apply the 3DGM to forward and inverse of gravity &magnetism, and develop the system which is suitable for interaction inversion for 3D gravityand magnetic anomalies bodies.In this thesis, the theory method of 3D visualization is studied, and the 3D geologicalmodel is also discussed according to the geological characterization. Using 3D visualizationtechnology, the geological model is expressed in the form of 3D reality picture. At last,human-computer interaction system for forward and inverse of gravity & magnetism isdeveloped. The main content of this thesis is as follows:(1) Discuss the 3D geological model which is divided into three classes: facial models,volumetric models and mixed models, then point out the main problems in 3D geosciencemodeling at present.(2) Adopt the surface-based model to modeling the geological body, in the process ofmodeling, the technique to edit 3D model from orthographic views is used to construct 3Dmodel. A new algorithm for modifying geometric and topological information is presented,including add, delete and move vertex for models. Mouse tracking ball is used to controlmodels rotating freely in interactive environment which provides auxiliary operation forconstructing models.(3) Study the Loop subdividing algorithm which is used to make the geological body morenatural.(4) Study the forward algorithms of gravity & magnetism, then design and develop the 3Dinteraction system for inversion of 3D gravity and magnetic anomalies bodies.更多还原