测绘学报
測繪學報
측회학보
ACTA GEODAETICA ET CARTOGRAPHICA SINICA
2015年
6期
694-701
,共8页
王金鑫%郑亚圣%李耀辉%禄丰年%刘俊楠
王金鑫%鄭亞聖%李耀輝%祿豐年%劉俊楠
왕금흠%정아골%리요휘%록봉년%류준남
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
全毬離散網格%地毬繫統空間網格%四元三角網%數字/智慧地毬%空間數據模型
전구리산망격%지구계통공간망격%사원삼각망%수자/지혜지구%공간수거모형
discrete global grids (DGGs)%Earth system spatial grid(ESSG)%quaternary triangular mesh (QTM)%digital/smart earth%spatial data model
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。
全毬離散網格是麵嚮空間大數據的模型框架,常用于構建數字地毬平檯。基于毬體的剖分瓦塊不僅可以構建真三維的數字地毬模型,而且可以實現天地一體化的空間數據集成、融閤、錶達和應用。本文詳細論述瞭毬體大圓弧 QTM 八扠樹網格的剖分原理、網格幾何特徵分析和編解碼方法等理論體繫,併利用剖分瓦塊實現瞭毬體的任意分割以及地下、地錶和空中實體的可視化建模。研究錶明,毬體QTM 網格具有剖分規則簡單、體繫規整、幾何特徵明晰,適用性彊等特點,尤其是可以推廣到橢毬。因而,該方案可用于天地一體化的空間數據的組織、管理與應用。
전구리산망격시면향공간대수거적모형광가,상용우구건수자지구평태。기우구체적부분와괴불부가이구건진삼유적수자지구모형,이차가이실현천지일체화적공간수거집성、융합、표체화응용。본문상세논술료구체대원호 QTM 팔차수망격적부분원리、망격궤하특정분석화편해마방법등이론체계,병이용부분와괴실현료구체적임의분할이급지하、지표화공중실체적가시화건모。연구표명,구체QTM 망격구유부분규칙간단、체계규정、궤하특정명석,괄용성강등특점,우기시가이추엄도타구。인이,해방안가용우천지일체화적공간수거적조직、관리여응용。
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.