摘要
针对普通Kriging法处理多波束测深数据受异常值影响的问题,推导变异函数样本值的抗差计算公式来消除异常值对变异函数拟合的干扰。利用实测数据对算法进行实现,验证其在精确估计和检测异常方面的优势。进一步采用该算法对数据进行规则格网的构建,将其与人工剔除异常生成的格网比较,获得一致的效果,证明算法在自动检测异常的同时生成高精度海底地形规则格网的可行性。
In view of the fact that the Ordinary Kriging algorithm will be influenced by outliers while processing multibeam bathymetry data.The calculating formula of sample variogram is deduced based on robust estimation,and the influence of outliers in fitting variogram function is controlled.The superiority of the algorithm in exactitude estimating and detecting outliers is proved by real data experiments.The regular square grids of multibeam data are also constructed by the algorithm.The grids values are compared with those which are calculated by manual processing,and they are consistent.It is proved that the seabed terrain grids can be constructed by the proposed algorithm in high precision and outliers can be detected automatically.
出处
《测绘学报》
EI
CSCD
北大核心
2011年第2期238-242,248,共6页
Acta Geodaetica et Cartographica Sinica
基金
中国博士后科学基金(20080431342)
信息工程大学测绘学院硕士学位论文创新与创优基金
关键词
普通Kriging法
抗差估计
多波束测深
变异函数
异常值
规则格网
ordinary Kriging algorithm
robust estimation
multibeam bathymetry
variogram function
outlier
regular square grid
