地球信息科学学报 ›› 2019, Vol. 21 ›› Issue (8): 1161-1169.doi: 10.12082/dqxxkx.2019.180682

• 地球信息科学理论与方法 • 上一篇    下一篇

真三维地质模型构建的球体测地线八叉树网格方法

王金鑫1,赵光成1,禄丰年2,张古彬3,曾涛3,*(),乔天荣3   

  1. 1. 郑州大学水利与环境学院,郑州 450001
    2. 河南省地质矿产勘查开发局,郑州 450012
    3. 河南省地质调查院,郑州 450001
  • 收稿日期:2018-12-24 修回日期:2019-04-29 出版日期:2019-08-25 发布日期:2019-08-25
  • 通讯作者: 曾涛 E-mail:14095104@qq.com
  • 作者简介:王金鑫(1968-),男,河南泌阳人,副教授,主要从事空间信息网格和农业遥感应用研究。E-mail: jxwang@zzu.edu.cn
  • 基金资助:
    河南省科技攻关项目(152102210031);河南省高等学校基础研究计划重点科研项目(16A170003);地理空间信息与数字技术国家测绘地理信息局工程技术研究中心开放基金项目(SIDT2017501);河南省地质矿产勘查开发局2018年财政规划项目(HNGM2018103)

Sphere Geodesic Octree Grid Method for True Three-Dimensional Geological Model Construction

WANG Jinxin1,ZHAO Guangcheng1,LU Fengnian2,ZHANG Gubin3,ZENG Tao3,*(),QIAO Tianrong3   

  1. 1. School of Water Conservancy & Environment, Zhengzhou University, Zhengzhou 450001, China;
    2. Henan Bureau of Geo-exploration & Mineral development, Zhengzhou 450001, China;
    3. Henan Institute of Geological Survey, Zhengzhou 450001, China
  • Received:2018-12-24 Revised:2019-04-29 Online:2019-08-25 Published:2019-08-25
  • Contact: ZENG Tao E-mail:14095104@qq.com
  • Supported by:
    Henan Science and Technology Project, No.152102210031(152102210031);Key Research Projects of Basic Research Programs of Henan Higher Education Institutions(16A170003);Open Fund of Engineering Technology Research Center of Geospatial Information and Digital Technology of National Bureau of Surveying and Mapping Geographic Information(SIDT2017501);2018 Financial Planning Project of Henan Bureau of Geo-exploration & Mineral development, No.HNGM2018103(HNGM2018103)

摘要:

三维地质空间表达可以准确揭示地质现象与过程的空间结构与分布规律。传统三维地质建模方法广泛存在着面向局部小区域、基于投影数据、表面静态建模、难以进行3D空间查询与分析、不利于时空大数据的组织与管理等缺陷。地球剖分网格以其全球全方位视角、循环递归剖分机制和有机灵活的编解码策略为解决上述问题、构建新一代数字地球平台提供了新的技术方案。本文以郑州航空港经济区为例,利用实测地质数据,基于球体测地线八叉树剖分瓦块(SGOG网格),建立区域真三维地质模型框架,并进行空间分析。在对原始数据进行预处理的基础上,将SGOG特定剖分层次的瓦块节点与地质体外包络体特征点数据进行匹配,构建真三维地质框架;通过漏洞修补和着色渲染,建立多尺度多地层三维地质体模型;在此基础上,进行真三维地质空间分析,包括地质体真三维剖面、数字钻孔以及几何特征参数计算。实验结果表明:本文的建模方法,不但结构简单,操作方便,适用于复杂不规则的地质体,而且可以利用SGOG瓦块的多尺度特性,灵活实现精度与尺度的自适应表达,方便进行多角度真三维空间分析。地球剖分网格是数字地球发展的必然趋势。

关键词: 地球剖分网格, 球体测地线八叉树网格, 真三维, 地质体, 郑州航空港经济区

Abstract:

Three-dimensional (3D) modeling has always been the subject of research in earth information science. The 3D geological space expression can accurately reveal the spatial structure and distribution pattern of geological phenomena and processes. Under the background of spatiotemporal big data, the contemporary Digital Earth platform is facing new opportunities. The traditional 3D geological modeling methods have the following limitations: local small area, projection data, surface static modeling, difficult 3D spatial query and analysis, and unfavorable organization and management of spatiotemporal big data. The Earth Tessellation Grid provides a new solution to solving the above problems and building a new generation digital earth platform with its global omnidirectional perspective, cyclic recursive splitting mechanism, and organic flexible codec strategy. Taking the Zhengzhou Airport Economic Zone as an example, this paper established a regional true 3D geological model framework based on the Sphere Geodesic Octree Grid bricks (SGOG grids) and conducted spatial analysis using measured geological data. Firstly, the original data was preprocessed. It mainly included data reading, data encryption, and projection and coordinate transformation. Next, the geological data and the SGOG split data was matched. The true 3D geological framework was constructed by matching the brick nodes of SGOG specific splitting level with the geological envelope feature points. Then, the multi-scale and multi-story 3D models were established through vulnerability patching and shade rendering. Among them, the vulnerability filling was achieved by recombining the SGOG brick voxels by their coding logic, and the shaded rendering of the bricks was implemented by the OSG's rendering engine. Finally, based on the above, the spatial analysis of the true 3D geological model was conducted, including the true 3D profile analysis, digital drilling, and geometric feature parameter calculation. The profiles were established by judging the position of the brick relative to the section line, which included three types of warp, weft, and arbitrary lines. Digital drillings were constructed by determining the bricks where the center point of the drillings were located. By calculating the external surface area of the upper and lower bricks of the geological body model and the volume of all the bricks, the upper and lower surface area and volume were determined. The experimental results show that the modeling method proposed in this paper is not only simple in structure and easy to operate, but also suitable for complex and irregular geological bodies. It can flexibly express the precision and scale by using the multi-scale characteristics of SGOG bricks, and convenient for multi-angle true 3D spatial analysis. The earth tessellation grid is an inevitable trend in the development of the digital earth.

Key words: Earth Tessellation Grid, Sphere Geodesic Octree Grid (SGOG), true three-dimensional, geological body, Zhengzhou airport economic zone