基于重力场模型与GPS水准组合法区域似大地水准面精化对比研究
发布时间：2018-08-29 12:39
【摘要】：开展数字城市建设,构建城市统一的地理空间框架和地理空间信息公共平台,是推进数字中国建设,加快信息化测绘体系建设的一项重要工作。城市区域的似大地水准面精化是数字城市建设的迫切需要。高分辨率、高精度的似大地水准面成果,能保证使用GPS直接测定正常高,能极大的提高测绘的工作效率,降低作业成本。本文首先介绍了研究背景和国内外似大地水准面精化的发展状况,以及国内城市区域似大地水准面精化的现状。接下来系统的介绍了似大地水准面精化的原理和多种方法,在此基础上,引出了地球重力场模型和对基于EGM2008模型的组合方法的探讨。本文计算数据选取陕西某地,简要介绍了测区GPS数据和水准数据的获取、平差计算以及其精度。分别采用二次多项式、多面函数、移动曲面、薄板样条等方法拟合测区似大地水准面,并比较了各种拟合方法的优缺点。然后采用基于EGM2008地球重力场模型的“移去-恢复”方法,对测区进行似大地水准面精化计算,之后将结果与GPS拟合方法进行比较分析,得出了基于EGM2008的GPS/水准法与该测区有较好的符合性的结论。文章最后对所做的工作进行了总结,提出了几条以后的工作中需要完善的问题。
[Abstract]:It is an important work to develop the digital city construction, to construct the unified geospatial frame and the public platform of geospatial information, to promote the construction of digital China and to speed up the construction of information surveying and mapping system. Quasi-geoid refinement in urban areas is an urgent need for the construction of digital cities. The high resolution and high precision quasi geoid results can guarantee the use of GPS to measure the normal height directly, can greatly improve the efficiency of surveying and mapping, and reduce the cost of activities. This paper first introduces the background of the research and the development of quasi geoid refinement at home and abroad, as well as the present situation of quasi geoid refinement in urban areas in China. Then the principle and various methods of quasi geoid refinement are introduced systematically. On this basis, the earth gravity field model and the combination method based on EGM2008 model are discussed. This paper introduces the acquisition, adjustment calculation and accuracy of GPS data and leveling data in the survey area. Quadratic polynomial, polyhedral function, moving surface and thin plate spline are used to fit the quasi geoid in the measured area, and the advantages and disadvantages of various fitting methods are compared. Then the "remove-restore" method based on the EGM2008 gravity field model is used to calculate the quasi geoid precision of the measured area, and the results are compared with the GPS fitting method. It is concluded that the GPS/ leveling method based on EGM2008 has good conformance with the measuring area. Finally, the paper summarizes the work done, and puts forward several problems that need to be perfected in the future work.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P223;P228.4
本文编号：2211236
[Abstract]:It is an important work to develop the digital city construction, to construct the unified geospatial frame and the public platform of geospatial information, to promote the construction of digital China and to speed up the construction of information surveying and mapping system. Quasi-geoid refinement in urban areas is an urgent need for the construction of digital cities. The high resolution and high precision quasi geoid results can guarantee the use of GPS to measure the normal height directly, can greatly improve the efficiency of surveying and mapping, and reduce the cost of activities. This paper first introduces the background of the research and the development of quasi geoid refinement at home and abroad, as well as the present situation of quasi geoid refinement in urban areas in China. Then the principle and various methods of quasi geoid refinement are introduced systematically. On this basis, the earth gravity field model and the combination method based on EGM2008 model are discussed. This paper introduces the acquisition, adjustment calculation and accuracy of GPS data and leveling data in the survey area. Quadratic polynomial, polyhedral function, moving surface and thin plate spline are used to fit the quasi geoid in the measured area, and the advantages and disadvantages of various fitting methods are compared. Then the "remove-restore" method based on the EGM2008 gravity field model is used to calculate the quasi geoid precision of the measured area, and the results are compared with the GPS fitting method. It is concluded that the GPS/ leveling method based on EGM2008 has good conformance with the measuring area. Finally, the paper summarizes the work done, and puts forward several problems that need to be perfected in the future work.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P223;P228.4
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相关硕士学位论文 前2条
1 肖荣健;地球重力场模型及其在隧道测量中的应用[D];西南交通大学;2007年
2 熊建华;采用分区法对局部区域进行大地水准面精化的研究[D];昆明理工大学;2014年
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