摘要
为了克服湖泊水深测量作业中对围网养殖区等区域水深数据采集的困难性,以不同插值方法分析对湖区测量盲区进行数据采集而存在的插值效果和精度差异性问题,以洪泽湖水下测量单波束水深数据作为研究样本点,利用反距离加权法、趋势面法、最近邻点插值法和普通克里金法,分别对未采集区进行水深数据空间插值。以交叉检验法和实测水深数据作对比,研究出一种基于方差值最小的拟合推估模型。实例表明:新的拟合推估模型内插效果精度较高,最大残差值为0.02 m,与原始水深值符合性较高,但内插数据的效率不如其他几种方法。
For solving the problem that water depth is hard to measure in purse net cultivation zone in the work of water depth measurement of lakes,different interpolations were used to analyze difference between interpolation effect and precision which were collected in measuring dead zone of lake.Hongze Lake was taken as sampling point,and inverse distance weighting method,trend surface method,nearest neighbor interpolation method and ordinary Kriging method were used to apply space interpolation for water depth.Compared with actural measurement data and that with cross test,a matching estimation model based on minimum variance yields was studied.The example showed that there is higher precision for interpolation effect in new matching estimation model with maximum residual value of 0.02 m,which is in accordance with original water depth,but the efficiency of interpolation data is lower than others.
作者
卞晓晨
黄张裕
张文祥
王睿
Bian Xiaochen;Huang Zhangyu;Zhang Wenxiang;Wang Rui(School of Earth Science and engineering, Hohai University, Nanjing 211100, China;Zhejiang Design Institute of Water Conservancy and Hydroelectric Power, Hangzhou 310002 ,China)
出处
《甘肃科学学报》
2018年第1期33-37,共5页
Journal of Gansu Sciences
关键词
单波束水深值
内插方法
拟合推估模型
内插精度
Single wave beam water depth
Interpolation method
Matching estimation model
Interpolation precision
