| 利用球体剖分瓦块构建真三维数字地球平台 |
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| 引用本文： | 王金鑫,郑亚圣,李耀辉,禄丰年,刘俊楠.利用球体剖分瓦块构建真三维数字地球平台[J].测绘学报,2015,44(6):694-701. |
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| 作者姓名： | 王金鑫 郑亚圣 李耀辉 禄丰年 刘俊楠 |
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| 作者单位： | 1. 郑州大学水利与环境学院, 河南 郑州 450001;2. 河南省测绘地理信息局, 河南 郑州 450003 |
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| 基金项目： | 测绘遥感信息工程国家重点实验室开放基金，矿山空间信息技术国家测绘地理信息局重点实验室开放基金，教育部大学生创新实验项目，郑州大学研究生教育专项基金(ZYJ2014050)@@@@Open Fund of Sta te Key Laboratory fo r info rmation Eng ineering in Su rveying;Mapping and Geo info rmation，Co l l ege Students innovation Experi ment Program of the Min i st ry of Education，Zhengzhou Un iversi ty Gradua te Student Education Spec i a l Fund Project |
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| 摘 要： | 全球离散网格是面向空间大数据的模型框架,常用于构建数字地球平台。基于球体的剖分瓦块不仅可以构建真三维的数字地球模型,而且可以实现天地一体化的空间数据集成、融合、表达和应用。本文详细论述了球体大圆弧QTM八叉树网格的剖分原理、网格几何特征分析和编解码方法等理论体系,并利用剖分瓦块实现了球体的任意分割以及地下、地表和空中实体的可视化建模。研究表明,球体QTM网格具有剖分规则简单、体系规整、几何特征明晰,适用性强等特点,尤其是可以推广到椭球。因而,该方案可用于天地一体化的空间数据的组织、管理与应用。
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| 关 键 词： | 全球离散网格 地球系统空间网格 四元三角网 数字/智慧地球 空间数据模型 |
| 收稿时间： | 2014-03-13 |
| 修稿时间： | 2014-10-22 |
Bui lding the Platform of Digital Earth with Sphere Spl it Bricks |
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| WANG Jinxin,ZHENG Yasheng,LI Yaohui,LU Fengnian,LIU Junnan.Bui lding the Platform of Digital Earth with Sphere Spl it Bricks[J].Acta Geodaetica et Cartographica Sinica,2015,44(6):694-701. |
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| Authors: | WANG Jinxin ZHENG Yasheng LI Yaohui LU Fengnian LIU Junnan |
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| Institution: | 1. School of Water Conservancy & Environment, Zhengzhou University, Zhengzhou 450001, China;2. Henan Administration of Surveying, Mapping & Geo-information, Zhengzhou 450003, China |
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| Abstract: | Discrete global grids,a model ing framework for big geo-spatial data,is always used to bui ld the Digital Earth platform.Based on the sphere spl it bricks (Earth system spatial grids),it can not only bui ld the true three-dimensional digital Earth model,but also can achieve integration,fusion,expression and appl ication of the spatial data which locates on,under or above the Earth subsurface.The theoretical system of spheroid geodesic QTM octree grid is discussed,including the partition principle,analysis of grid geometry features and coding/decoding method etc,and a prototype system of true-3D digital Earth plat-form with the sphere spl it bricks is developed.The functions of the system mainly include the arbitrary sphere segmentation and the visual ization of physical models of underground,surface and aerial entities. Results show that the sphere geodesic QTM octree grid has many appl ication advantages,such as simple subdivision rules,the grid system neat,clear geometric features,strong appl icabi l ity etc.In particular,it can be extended to the el l ipsoid,so it can be used for organization,management,integration and appl i-cation of the global spatial big data. |
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| Keywords: | discrete global grids (DGGs) Earth system spatial grid(ESSG) quaternary triangular mesh (QTM) digital/smart earth spatial data model |
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