| GeoSOT-3D椭球体剖分真三维数据表达 |
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| 引用本文： | 孙忠秋,程承旗.GeoSOT-3D椭球体剖分真三维数据表达[J].地理信息世界,2016(3):40-46. |
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| 作者姓名： | 孙忠秋 程承旗 |
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| 作者单位： | 1. 北京大学 遥感与地理信息系统研究所,北京,100871;2. 北京大学 工学院航空航天工程系,北京,100871 |
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| 摘 要： | 随着地球观测技术和信息技术的进步,以全球为背景的科学探索不断增多,不仅是地球表面信息,地下、水下、空中等地球上各个层次的空间信息都受到极大的关注。地球球体剖分网格可以构建真三维的数据模型,进而实现空天地、地下水下一体化的空间数据组织、管理、表达与应用。本文详细论述了GeoSOT-3D椭球体剖分网格的剖分空间框架、剖分编码与剖分尺度特性等理论体系。建立基于GeoSOT-3D的空间对象的真三维表达模型。利用该真三维模型实现了地球椭球体的地上地下可视化,点线面体等空间实体的可视化。研究表明,GeoSOT-3D椭球体剖分具有椭球剖分框架简单、体系完整、二三维一致等特点,因而在该框架下的真三维数据模型可用于下一代地理信息系统中的空间大数据的组织管理与表达。
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| 关 键 词： | GeoSOT-3D 椭球体剖分 真三维 表达模型 |
True 3D Data Expression Based on GeoSOT-3D Ellipsoid Subdivision |
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| Abstract: | Along with the development of the earth observation technology and information technology, the digital earth platform has developed. However, the existing digital earth model has been constructed by using the spherical surface of the 2.5 dimensional earth surface. The nature of the model is the earth's surface without the inner of the earth. At present, the scientific exploration of the earth is increasingly extensive, not only the earth's surface, but also underground, underwater, air and other levels of space have been greatly concerned. The subdivision of the earth can be used to construct the true 3D data model, and then the organization, management, expression and application of the spatial data could be realized through the data model. In this paper, the theoretical system of the GeoSOT-3D ellipsoid subdivision frame is proposed, discussed the different types of the division code and the split scale characteristic. A true 3D representation model of spatial objects based on GeoSOT-3D is established for different spatial entities including the point, line, and body. Based on the true 3D model, the true 3D model visualization of spatial entity body is realized. At last, a true 3D digital spatial data system is designed. Through the experiments built on the true 3D system, the research shows that the GeoSOT-3D ellipsoid subdivision frame has the advantage characteristics of simple, complete, and identical in the two and three dimension, the true 3D data model can be used to organize and manage the spatial data in the next generation of GIS. |
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| Keywords: | GeoSOT-3D(Geographic alcoordinates Subdivision grid-3D) ellipsoid subdivision true 3D expression model |
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