带约束的体元属性插值方法与可视化表达  

Attribute Interpolation and Visualization of Voxel Model with Constraint

作　　者：张慧[1] 刘刚[2,3] 陈麒玉[2] 

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]中国地质大学(武汉)计算机学院,武汉430074 [3]中国地质大学(武汉)智能地学信息处理湖北省重点实验室,武汉430074

出　　处：《地质科技情报》2017年第6期267-272,共6页Geological Science and Technology Information

基　　金：国家863计划重点项目课题(2012AA121401);国家自然科学基金项目(41172300)

摘　　要：在地质体体元剖分、属性插值中如何实现属性模型和空间结构模型的一致性,体现地质知识的表达,是一个难点问题。融合边界表示法和角点网格模型,以B-Rep表达地质体空间形态,以角点网格模型离散化地质体,建立地质体三维结构模型及其属性模型。充分考虑到地质原理和相关的地质约束条件,对位于断层面两边同一地层插值时,采用"距离环绕法"求点对距离参与插值计算。在地质体建模时引入"等时地层"的概念,纵向上采用分层插值的方式对属于同一等时地层的地质体属性数据进行求值,横向上采用分区域插值的方法,通过提取沉积相边界来添加控制线约束插值,很好地解决了地质体结构模型对地质体属性模型的插值约束问题。将理论与实践相结合,利用福州三维城市地质数据,将基于角点网格的体元模型和三维属性插值算法实际应用到三维城市地质系统的建模中。It is a difficult to realize the consistency of attribute model and spatial structure model in geolog- ical body division and attribute interpolation, and to express geological knowledge. In this paper, based on the boundary representation and the corner grid model, the 3D structure model and its attribute model are established by using B-Rep to express the spatial shape of the geological body, and the geological body is discretized by the corner grid model. According to the geological theory and the related geological con- straints, the distance between the two sides of the fault plane is calculated by the method of ＂distance sur- round＂ for interpolation. By introducing the concept of ＂isochronous＂ in geological modeling, the geolog- ical attribute data of the same isochronostratigraphic is evaluated by hierarchical interpolation method. U- sing sedimentary facies constrained interpolation in the horizontal, by extracting the boundary of sedimen- tary facies, the control line is added to constrain the interpolation. It is a good method to solve the problem of the geological structure model to the interpolation constraint of the geological body model. Using the 8D urban geological data of Fuz^hou, the voxel model based on corner grid and the 3D attribute interpolation algorithm are applied to the modeling of 3D urban geological system.

关 键 词：体元模型 地质约束 属性插值 可视化 

分 类 号：P588.12[天文地球—岩石学]