线状狭长区域水下地形测量中高程转换问题探讨  

Discussion on Elevation Conversion of Underwater Topographic Survey in Linear Areas

作　　者：陈景涛 孙文亮 程彬 张伟琪 刘胜震 CHEN Jingtao;SUN Wenliang;CHENG Bin;ZHANG Weiqi;LIU Shengzhen(The First Geodetic Surveying Brigade of MNR,Xi’an 710054,China)

机构地区：[1]自然资源部第一大地测量队,陕西西安710054

出　　处：《地理空间信息》2025年第3期106-108,117,共4页Geospatial Information

基　　金：国家重点研发计划资助项目(2016YFC0803109);陕西测绘地理信息局科技创新资助项目(SCK2023-01)。

摘　　要：河流、部分湖泊水库等水域曲折狭长,周边控制点布设受到诸多限制,控制点分布网形不佳。针对GNSS三维水深测量的高程转换问题,构建了结合XGM2019e地球重力场模型的高程转换方法,并通过工程实例进行高程转换实验和精度评估。结果表明,XGM2019e—二次曲面拟合方法的转换精度优于常规二次曲面拟合方法;但当控制点较少时,XGM2019e—平面拟合方法的精度低于常规平面方法。另外,可通过增加多余控制点、调整控制点分布的方式提高转换精度。In the area of rivers,some lakes and reservoirs with the features of meander and narrow,the distribution of control points around the water area is restricted,and the distribution network of control points is not good.Aiming at the elevation conversion problem of GNSS 3D bathymetry in this area,we constructed some elevation conversion methods combined with the XGM2019e earth gravity field model,and carried out conversion experiment through engineering examples and evaluated the accuracy.The results show that the conversion accuracy of XGM2019e-quadric surface fitting method is better than that of conventional quadric surface fitting method.However,when the number of control points is small,the accuracy of XGM2019e-plane fitting method is lower than that of conventional plane method.In addition,the conversion accuracy can be improved by adding redundant control points and adjusting the distribution of control points.

关 键 词：水下地形测量 高程异常 XGM2019e 移去—恢复 

分 类 号：P223[天文地球—大地测量学与测量工程]