Dynamic Topography Estimates Using Geosat Data and A Gravimetric Geoid In the Gulf Stream Region   总被引：1，自引：0，他引：1  

Richard H. Rapp  Yan Ming Wang 《Geophysical Journal International》1994,117(2):511-528

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Bouguer anomalies and the geoid: a reassessment of Stokes' method     

R. G. Hipkin 《Geophysical Journal International》1988,92(1):53-66

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Gravity field mapping from satellite altimetry, sea-gravimetry and bathymetry in the Eastern Mediterranean     

D. Arabelos  C. C. Tscherning 《Geophysical Journal International》1988,92(2):195-206

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基于移去-恢复法的局部似大地水准面精化模型对比研究     

李明飞  吴军超  秦川 《大地测量与地球动力学》2020,40(9):952-956

针对似大地水准面在精化过程中不同移去-恢复高程转换模型的适用性和选取问题,基于二次曲面和EGM2008重力场模型,分别构建了RBF神经网络、多面函数和Shepard等3种类型的移去-恢复模型,结合平原和高原山区两个工程实例,通过调整高程拟合点数目进行似大地水准面拟合与精度对比。结果表明,在平原地区,EGM2008-多面函数高程模型精度略优于其他模型;在高原山区,当拟合点数较少时,基于EGM2008的移去-恢复模型精度高于基于二次曲面的移去-恢复模型,其中,EGM2008-多面函数和EGM2008-Shepard较优,而随着拟合点数目的增加,二次曲面-Shepard高程转换模型的精度优于其他模型。  相似文献   

Regional geoid determination in Antarctica utilizing airborne gravity and topography data   总被引：2，自引：2，他引：0  

Mirko Scheinert  Jan Müller  Reinhard Dietrich  Detlef Damaske  Volkmar Damm 《Journal of Geodesy》2008,82(7):403-414

Antarctica is the only continent that suffers major gaps in terrestrial gravity data coverage. To overcome this problem and to close these gaps as well as to densify the global satellite gravity field solutions, the International Association of Geodesy (IAG) Commission Project 2.4 “Antarctic Geoid” was set into action. This paper reviews the current situation concerning the gravity field in Antarctica. It is shown that airborne geophysical surveys are the most promising tools to gain new gravity data in Antarctica. In this context, a number of projects to be carried out during the International Polar Year 2007/2008 will contribute to this goal. To demonstrate the feasibility of the regional geoid improvement in Antarctica, we present a case study using gravity and topography data of the southern Prince Charles Mountains, East Antarctica. During the processing, the remove–compute– restore (RCR) technique and least-squares collocation (LSC) were applied. Adding signal parts of up to 6 m to the global gravity field model that was used as a basis, the calculated regional quasigeoid reveals the dominant features of bedrock topography in that region, namely the graben structure of the Lambert glacier system. The accuracy of the improved regional quasigeoid is estimated to be at the level of 15 cm.  相似文献   

大地水准面数值计算及结构分析     

王建强  储王宁  戴必旭  刘思涵 《测绘科学》2017,42(4)

针对大地水准面精化问题,该文提出了基于大地水准面起伏几何性质构建精确大地水准面的方法。相对传统方法根据经验公式设计精化大地水准面分辨率,该文提出了一种顾及区域性特点的大地水准面分辨率设计方法,推导了构建厘米级大地水准面需要达到的空间分辨率计算公式。采用Alltrans EGM2008Calculator 1.00软件计算不同区域的大地水准面高程,并用坡度方法分析大地水准面的精细结构。最后以江西省大地水准面起伏为基础,采用该方法进行计算。结果表明:构建厘米级大地水准面需要达到的空间分辨率为7″,可为大地水准面精化研究提供参考。  相似文献   

Digital astro-geodetic camera system for the measurement of the deflections of the vertical: tests and results     

K. Halicioglu  R. Deniz  H. Ozener 《International Journal of Digital Earth》2016,9(9):914-923

This study introduces the new results of a novel low-cost digital zenith camera system operated in Turkey that uses astronomical and geodetic instrumentation. Currently, it is possible to determine deflections of the vertical (DoV) components by using a vast amount of information gathered from geo-referenced star images, tilt measurements, and Global Navigation Satellite System technology. This new design of an astro-geodetic camera system is used for calculating DoV components with 12 independent solutions on a test station in Istanbul, and additional observations were performed to investigate the external accuracy of the system on a test network. A specific leveling method is developed to align system toward the zenithal direction. The final results of the observations on a test station located in Istanbul indicate that the accuracy of the system is about ±0.19 arc-seconds in latitude and ±0.28 arc-seconds in longitude determination. The system has been further tested on a network with 4 control points that have averagely 20?km baselines. At the test network, the root mean square of the average value of the vertical deflections is calculated as ±0.36 arc-seconds. Furthermore, DoV components are compared with the values that are calculated using global geopotential models.  相似文献   

南桑威奇俯冲带大地水准面异常及其地幔对流特征分析     

刘心哲  陈文文  邢军辉  吴晓阳  安隆  张浩  彭树聪 《海洋科学》2019,43(9):54-63

以南桑威奇俯冲带为例,根据EGM2008超高阶地球重力场模型、卫星重力数据为基础,利用移去-恢复原理计算了研究区大地水准面,实现了研究区不同场源深度大地水准面异常信息的分离,根据Runcorn模型计算了研究区小尺度地幔对流应力场,并结合天然地震空间展布和前人研究成果,对俯冲带结构特征与地幔对流模式进行了探讨。结果表明:南桑威奇俯冲带具有俯冲倾角较大、地震震级较低、弧前侵蚀明显等典型的马里亚纳型俯冲带特征,俯冲带南北部俯冲深度存在明显差异,中段偏北俯冲深度可达500 km;受到软流圈与上地幔上部物质密度差异的控制,东斯科舍海脊下存在沿海脊轴向南流动强地幔流;俯冲带结构与小尺度地幔对流应力场具有很强的相关性。本研究对于搞清南桑威奇俯冲带深部构造特征,理解俯冲运动、地幔对流方向及其动力控制机制提供了新的研究思路和方法。  相似文献   

测量信息管理系统的设计与功能实现     

田晋  张哲 《海洋测绘》2008,28(5):39-41

现代测量种类繁多，各种数据缺乏统一管理，为此设计并创建测量信息管理系统（SIMS），在不同数据库簇分类的基础上，通过定义数据库模板来实现同一簇数据库文件的自动化创建，主程序可以方便地对相关测量数据库进行编辑、查询、统计与控制等管理操作；系统可对各种测量数据进行统一的数据库创建与管理，有助于不同测量数据存储与管理的标准化。  相似文献   

利用GPS精化区域似大地水准面   总被引：3，自引：0，他引：3  

张正禄  邓勇  罗长林  宋玉兵 《大地测量与地球动力学》2006,26(4):14-17

基于原有似大地水准面,在区域设计一些具有高精度的GPS大地高和水准高的公共点,采用数学拟合方法可得该区域似大地水准面的精化模型。由精化后的似大地水准面可得到区域内任一GPS测点的水准高程,从而代替五等水准测量和三角高程测量。  相似文献