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测绘学报  2014 

球面菱形离散格网正二十面体剖分法

DOI: 10.13485/j.cnki.11-2089.2014.0192, PP. 1293-1299

Keywords: 全球离散格网,菱形,正二十面体,层次递归剖分,几何形变

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Abstract:

基于菱形单元的球面离散格网具有结构简单和方向性一致等优点,使得其适用于全球多尺度空间数据建模与分析.本文提出一种球面菱形离散格网正二十面体剖分法.首先根据地球的主要地理特征确定正二十面体各个顶点在球面上的位置;其次针对南北两极处的极点奇异性,建立了球面经纬度坐标与三维直角坐标之间的转换关系,在此基础上提出球面菱形离散格网层次递归剖分算法,并从菱形格网单元面积、长短轴比两方面对剖分结果进行几何形变分析;最后验证了本文方法的可行性,试验结果表明,该方法可有效地构建基于正二十面体的球面菱形离散格网,其总体几何特性明显优于基于正八面体构建的球面菱形离散格网.

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