基于层面结构的地质块体拓扑关系的自动构建

在地质建模中，基于层面的地质块体结构模型的获取是其中最重要的环节之一，目前的构建方法仅关注地质块体的提取和算法效率的提高，忽略了对地质块体与其组成面片以及各地质块体之间拓扑关系的建立，为此，本文提出了一种新的构建方法，基本思路是：首先,利用边界线与曲面片的关系，提取方向边和方向三角形，其次，按照右手法则建立面片排序表，最后，按照一定的遍历规则获取每个面片的正体和负体。此方法不仅可以自动确定地质块体与地质曲面片的组成关系，还可间接分析地质块体之间的邻接关系，从而为三维地质体模型的建立以及三维地质体拓扑查询和分析奠定基础。

Automatic Construction of Topological Relationship of 3D Geological Blocks Based on Stratified Geological Structure

The acquisition of the geological block structure model which is based on stratified geological structure is one of the most important steps in geological modeling.In present construction methods,attention is merely paid to the extraction of geological blocks and the improvement of the algorithmic efficiency,but not the establishment of the topological relationship between geological blocks and their faces or the establishment of the topological relationship among geological blocks.A construction method is proposed.Firstly,direction-edge and direction-triangle are extracted by making use of the relationship between the boundary lines and the faces;and then the sort-table of three-dimensional faces is established according to right-hand rule;finally,the positive and negative body of each face is obtained according to certain ergodic rules.This method can not only be used to automatically define the relationship between the geological blocks and their faces,but also indirectly analyze the adjacent relationship between geological blocks.