基于Arcgis的开采沉陷区水下地形空间插值方法分析

Spatial interpolation method analysis of Arcgis-based underwater terrain in subsidence area

为探究无人船在复杂地形中测量数据最优空间插值方法,基于Arcgis软件的3D Analyst功能,采用不同的空间插值法建立水下三维地形模型,通过与实测数据进行精度分析,其中,反距离权重法的均方根误差为0.132 4 m,平均误差为0.041 2 m,绝对值最大误差为2.233 5 m,精度结果优于克里金插值法、径向基函数法和自然邻域法,在沉陷区复杂地形环境下建立三维模型精度最高。通过进一步探究,实验结果显示参数P为3时反距离权重法精度最优。

In order to explore the optimal spatial interpolation method for unmanned ship measurement data in complex terrain,based on the 3D Analyst function of Arcgis software,different spatial interpolation methods are used to establish underwater 3D terrain model,and the accuracy analysis is carried out with measured data.The Root Mean Squared Error of the Inverse Distance Weighted method is 0.122 3 m,whose average error is 0.046 3 m and absolute maximum error is 2.253 5 m.The accuracy result is better than the Kriging interpolation method,the Radial Basis Function method and the Natural Neighborhood method.So in the complex subsidence area,the three-dimensional model of the Inverse Distance Weighted method is the most accurate.Through further investigation,the experimental result shows that the Inverse Distance Weighted method has the best precision when the parameter P is 3.The result of the study can provide a reference for post-processing methods for unmanned ships to measure data in complex terrain.