球面离散网格与球体离散网格的比较研究

Comparison of surface and solid discrete global grids

测地线在球体剖分中扮演着十分重要的角色,它保证了球体剖分网格单元的形体简单性和空间关系的一致性。本文基于对欧式空间和流空间的数学认识,探讨了球体剖分的评价标准,提出了基于大圆弧QTM的球体八叉树剖分方法,并指出作为一种大尺度的集成三维空间数据模型,全球三维离散网格是地理信息科学的一个新的发展方向。

Geodesic plays an important role at the sphere subdivision process, and it guarantees the shape simplicity of the sphere grid cell and the consistency of spatial relationships of the entire grid system. This article discussed the evaluation criteria of the spherical volume subdivision, presented a cutting method of global 3D grids based on great circle arc QTM sphere octree, and finally pointed out that as a new large-scale 3D integration data model, the global solide discrete grids woule be a new developing direction of geographic information science research.