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考虑自然邻点影响域的多波束测深数据趋势面滤波改进算法
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Journal Article
考虑自然邻点影响域的多波束测深数据趋势面滤波改进算法
2018
Overview
针对传统趋势面滤波法在多波束测深数据粗差探测方面存在曲面拟合函数不确定、滤波不彻底以及部分水深点被不合理剔除的问题,通过引入散乱水深点局部最小范围——自然邻点影响域的概念,提出一种基于自然邻点影响域的多波束测深数据趋势面滤波改进算法。首先,通过对自然邻点影响域内的局部曲面进行分析,构造了影响域内特定局部坐标系下的统一曲面拟合函数;然后,利用该统一曲面拟合函数按照所提传递式迭代趋势面滤波法进行顺次迭代逐步滤除影响正常水深点判定的粗差数据;最后,根据突变地形边界点在其相邻邻域地形内连续性不一致的特性,建立了面向突变地形边界点的判断准则。试验结果表明：该改进算法可适应不同复杂程度的海底地形,有效剔除多波束水深数据中的粗差点,同时对实际海底地形中的正常水深点和各种特殊水深点进行保留,显著提高了海底地形表达的精度。
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