面向海岛礁 DEM 构建的精度需求,定量分析了水深源数据质量对海岛礁 DEM 精度的影响规律。梳理了海岛礁 DEM 构建的基本过程,分析了海岛礁 DEM 精度的影响因素。在此基础上,以目前普遍执行的有关水深测量的国内外行业规范为依据,统计分...面向海岛礁 DEM 构建的精度需求,定量分析了水深源数据质量对海岛礁 DEM 精度的影响规律。梳理了海岛礁 DEM 构建的基本过程,分析了海岛礁 DEM 精度的影响因素。在此基础上,以目前普遍执行的有关水深测量的国内外行业规范为依据,统计分析水深源数据的精度、密度等因素对海岛礁 DEM 精度的影响规律。实验结果表明:采用自适应三角网建模方法所建海岛礁 DEM 的精度要优于规则三角网 DEM 的精度;执行我国海道测量规范所获取的水深源数据所建 DEM 精度,要优于国际海道测量标准一等要求的源数据所建模型精度,略低于特等要求下的源数据所建模型精度。展开更多
We present a novel algorithm for adaptive triangular mesh coarsening. The algorithm has two stages. First, the input triangular mesh is refined by iteratively applying the adaptive subdivision operator that performs a...We present a novel algorithm for adaptive triangular mesh coarsening. The algorithm has two stages. First, the input triangular mesh is refined by iteratively applying the adaptive subdivision operator that performs a so-called red-green split. Second, the refined mesh is simplified by a clustering algorithm based on centroidal Voronoi tessellations (CVTs). The accuracy and good quality of the output triangular mesh are achieved by combining adaptive subdivision and the CVTs technique. Test results showed the mesh coarsening scheme to be robust and effective. Examples are shown that validate the method.展开更多
文摘面向海岛礁 DEM 构建的精度需求,定量分析了水深源数据质量对海岛礁 DEM 精度的影响规律。梳理了海岛礁 DEM 构建的基本过程,分析了海岛礁 DEM 精度的影响因素。在此基础上,以目前普遍执行的有关水深测量的国内外行业规范为依据,统计分析水深源数据的精度、密度等因素对海岛礁 DEM 精度的影响规律。实验结果表明:采用自适应三角网建模方法所建海岛礁 DEM 的精度要优于规则三角网 DEM 的精度;执行我国海道测量规范所获取的水深源数据所建 DEM 精度,要优于国际海道测量标准一等要求的源数据所建模型精度,略低于特等要求下的源数据所建模型精度。
基金supported by the National Natural Science Foundation of China (No. 60773179)the National Basic Research Program (973) of China (No. 2004CB318000)
文摘We present a novel algorithm for adaptive triangular mesh coarsening. The algorithm has two stages. First, the input triangular mesh is refined by iteratively applying the adaptive subdivision operator that performs a so-called red-green split. Second, the refined mesh is simplified by a clustering algorithm based on centroidal Voronoi tessellations (CVTs). The accuracy and good quality of the output triangular mesh are achieved by combining adaptive subdivision and the CVTs technique. Test results showed the mesh coarsening scheme to be robust and effective. Examples are shown that validate the method.