球体剖分瓦块的大区域真三维地理场景构建

发布时间：2018-03-31 12:51

本文选题：全球离散网格　切入点：地球系统空间网格　出处：《测绘科学》2017年10期

【摘要】：针对目前地理信息科学领域存在的三维地理场景大都是局部的、基于投影的2.5维表面模型的问题,该文提出了利用球体大圆弧八叉树剖分(SGOG)瓦块建立大区域真三维地理场景的方法。将SGOG特定剖分层次的顶点与全球共享DEM数据进行匹配,构建大区域真三维地形框架;以地形起伏度为阈值,采用不同层次的瓦块进行自适应建模,大大减少了数据量;粘贴遥感纹理,建立虚拟地理场景。中国大陆地区的实验结果表明:所提方法不但顾及了地球曲率,克服了投影变形的缺陷,而且可以利用SGOG多尺度特性,灵活建立各种(混合)尺度的模型,并可实现地表上下空间的一体化建模。
[Abstract]:In view of the problem that most of the 3D geographic scenes in the field of geographic information science are local and projection based on 2.5 dimensional surface model, In this paper, a method of constructing true 3D geographic scene in large area by using spherical large arc octree partition tile is proposed. The vertices of specific level of SGOG are matched with global shared DEM data, and the true 3D terrain framework of large area is constructed. With terrain relief as threshold, adaptive modeling with different levels of tiles can greatly reduce the amount of data, paste remote sensing texture, The experimental results in mainland China show that the proposed method not only takes into account the curvature of the earth and overcomes the defects of projection deformation, but also makes use of the multi-scale characteristics of SGOG to flexibly establish various (mixed) scale models. The integrated modeling of upper and lower surface space can be realized.
【作者单位】：郑州大学水利与环境学院;
【基金】：河南省科技攻关项目(152102210031) 河南省高等学校重点科研项目基础研究计划项目(16A170003) 郑州大学研究生教育科研专项支持基金项目;郑州大学大学生创新实验项目(2014xjxm056)
【分类号】：P208

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