不同比例尺下单波束测深数据的插值方法精度分析

Accuracy Analysis of Interpolation Method for Single-beam Bathymetric Data at Different Scales

以某内河航道局部航段作为试验区域,对不同比例尺单波束测深数据采用空间插值方法进行格网化,同时与多波束测深系统的实测数据进行对比,统计插值方法精度特征指标。结果表明,不同比例尺水深源数据密度对空间插值方法影响显著,随着测量比例尺不断减小,空间插值方法的内插精度下降明显;对于比例尺大于1:500的水深数据源,克里金插值法、最小曲率法和线性插值三角网法3种插值方法的精度基本相当,反距离加权插值法不满足插值精度要求;综合考虑内插精度特征参数,在类似区域建议采用线性插值三角网法。

Taking a local segment of an inland waterway as the test area,the spatial interpolation method was used to grid the single beam sounding data with different scales.At the same time,it was compared with the measured water depth data of multi-beam sounding system to count the accuracy characteristic indexes of interpolation methods.The results showed that:The data density of water depth sources with different scales had a significant impact on the spatial interpolation method.As the measurement scale decreases,the interpolation accuracy of spatial interpolation method decreases obviously.For water depth data sources with a scale greater than 1/500,the accuracy of Kriging interpolation method,minimum curvature method and linear interpolation triangulation method was basically the same.The inverse distance weighted interpolation method did not meet the requirements of interpolation accuracy.Comprehensively considering the characteristic parameters of interpolation accuracy,linear interpolation triangulation method is recommended in similar areas.