ESDA支持下的GPS高程转换模型研究
GPS Height Transformation Based on Exploratory Spatial Data Analysis
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摘要: 基于探索性空间数据分析(exploratory spatial data analysis,ESDA)及Kriging插值理论,提出了顾及高程异常空间变异性的GPS高程Kriging拟合模型。根据逐步比较法的思想,将影响Kriging插值的因子进行组合,得到5种典型建模方案。通过分析比较方案的误差,确定ESDA支持下的高程转换最佳模型ESDA-K。以某测区的高程异常数据为例,进行ESDA-K和神经网络等不同拟合方法的比较分析。结果表明,ESDA-K模型的精度优于其他方法,而且精度稳定,克服了传统方法的局部振荡、过学习、易陷于局部极值等不足。Abstract: We introduced the exploratory spatial data analysis(ESDA) and Kriging theory,and proposed an improved spatial variability-oriented Kriging interpolating model for GPS height transformation.Five kinds of typical modeling scheme were put forward through combining Kriging interpolation factors with the ideas of step-by-step comparison.The error results shows that the No.4 scheme is the best one,which is called ESDA-K.We did an experiment with ESDA-K,neural network to simulate GPS height anomaly.Experimental results show that the simulating accuracy of ESDA-K is more excellent than that of traditional methods.The ESDA-K model's precision is stable,and the model resolves the questions that traditional methods must face,such as local undulation,over-learning,falling into regional maximum easily etc.