顾及地球重力场模型的高程转换方法  

Height Conversion Method Considering Earth Gravity Field Model

作　　者：王式太 肖守圣 殷敏 华磊 姜新伟 程波[4] WANG Shitai;XIAO Shousheng;YIN Min;HUA Lei;JIANG Xinwei;CHENG Bo(College of Geomatics and Geoinformation,Guilin 541006,China;Guangxi Key Laboratory of Spatial Information and Geomatics,Guilin 541006,China;School of Public Administration,China University of Geosciences(Wuhan),Wuhan 430074,China;Shandong GEO-Surveying and Mapping Institute,Jinan 250013,China)

机构地区：[1]桂林理工大学测绘地理信息学院,广西桂林541006 [2]广西空间信息与测绘重点实验室,广西桂林541006 [3]中国地质大学(武汉)公共管理学院,湖北武汉430074 [4]山东省地质测绘院,山东济南250013

出　　处：《无线电工程》2023年第1期40-46,共7页Radio Engineering

基　　金：广西自然科学基金(2018GXNSFAA281279);广西高校中青年教师科研基础能力提升项目(2022KY1163);广西空间信息与测绘重点实验室主任基金(19-050-11-27)。

摘　　要：高程异常值计算过程中,几何内插方法对已知点数量要求高且在山区精度较低,结合地球重力场数据可有效提高高程转换精度,为验证不同地球重力场模型与不同几何函数结合的算法精度,以四川名山地区的已知数据为例,采用2种选点方案、3种重力场模型和3种几何内插模型分别组合,以“移去—恢复”法分别进行GNSS高程转换,得到EIGEN6C4地球重力场模型与二次曲面函数相结合的最佳拟合模型,并以广西钦州石瓯山水库为例将此拟合模型应用于无人机摄影测量的高程计算中。结果表明,相比无人机处理软件Pix4Dmapper直接得到的高程异常和通过二次曲面函数计算获得的高程异常,该拟合模型的精度和可靠性更高。In the process of height anomaly calculation, the geometric interpolation method requires large number of known points and has low accuracy in mountainous areas. Combining with earth gravity field data can effectively improve the accuracy of height conversion. In order to verify the accuracy of different earth gravity field models combined with different geometric functions, the known data of Mingshan area in Sichuan Province is taken as an example. Two point selection schemes, three gravity field models and three geometric interpolation models are combined respectively, performing GNSS elevation conversion with the method of “remove-restore”. The best fitting model by the combination of EIGEN6C4 earth gravity field model and quadric surface function is obtained, and the fitting model is applied to the height calculation of UAV photogrammetry with Shioushan reservoir in Qinzhou, Guangxi as an example. The results show that the accuracy and reliability of the fitting model are higher than the height anomaly directly obtained by the UAV processing software Pix4Dmapper or quadric function calculation.

关 键 词：无人机摄影测量 高程异常 地球重力场 移去—恢复 

分 类 号：P228.4[天文地球—大地测量学与测量工程]