似大地水准面高程异常拟合方法分析研究  

Analysis and Research on Fitting Methods of Quasi-geoid Elevation Anomaly

作　　者：张丹丹 ZHANG Dandan(Fujian Institute of Geological Engineering,Fuzhou 350000,China)

机构地区：[1]福建省地质工程研究院,福建福州350000

出　　处：《测绘与空间地理信息》2024年第11期190-193,共4页Geomatics & Spatial Information Technology

摘　　要：通过对似大地水准面拟合方法及必要性进行分析研究,单一拟合模型普遍具有一定的局限性,难以满足地形复杂区域拟合精度要求。针对该弊端,本文以某地区高程控制测量项目为研究对象,利用GNSS水准联测数据分别构建多项式拟合模型、多面函数拟合模型,然后通过最优加权平均算法对单一拟合模型拟合成果进行组合处理,形成最优加权平均模型,对研究区似大地水准面进行拟合,通过对3种模型的内外符合精度、检核点误差及误差分布情况进行对比分析,验证了最优加权平均模型相较于单一模型能够更为准确地对区域似大地水准面进行拟合精化,整体拟合效果大大提升,同时最优加权平均模型适用性较高,可操作性较强,能够实现不同地形条件区域似大地水准面的精确获取。In this paper,the quasi-geoid fitting method and its necessity are analyzed and studied.The single fitting model generally has certain limitations,which is difficult to meet the requirements of fitting accuracy in complex terrain areas.Aiming at this defect,this paper takes the elevation control survey project in a certain region as the research object,constructs polynomial fitting model and polyhedral function fitting model respectively by using the GNSS level joint survey data,and then combines the fitting results of the single fitting model with the optimal weighted average algorithm to form the optimal weighted average model to fit the quasi-geoid in the study area.By comparing and analyzing the internal and external coincidence accuracy,check point errors and error distribution of the three models,it is verified that the optimal weighted average model can fit the regional quasi-geoid more accurately than the single model,and the overall fitting effect is greatly improved.At the same time,the optimal weighted average model has high applicability and strong operability.It can achieve accurate acquisition of quasi-geoid in different terrain conditions.

关 键 词：似大地水准面 高程异常 拟合模型 最优加权平均模型 

分 类 号：P224[天文地球—大地测量学与测量工程]