On the effect of planar approximation in the Geodetic Boundary Value Problem

On the effect of planar approximation in the Geodetic Boundary Value Problem
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论平面逼近在大地边值问题中的作用

DOI:
10.1007/s11200-013-0249-4
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发表时间:
2014
影响因子:
0.9
通讯作者:
Grombein
Grombein
中科院分区:
地球科学4区
文献类型:
--
作者:
Müßle;Grombein

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在大地边值问题(GBVP)的分析处理的框架内,各种近似是必要的,以结束与一个“封闭”形式的解决方案。除了线性化和各向同性(“球面”)近似的情况下,所谓的平面近似已被引入的非球面,地形边界表面。在这种情况下,术语“平面近似”是指忽略相应核函数中与海拔和平均地球半径的商成比例的项,而不是与通过平面近似边界表面相混淆。本文估计了平面近似对固定GBVP边界条件和扰动势的影响。根据全球重力场模型EGM2008和地形模型DTM2006.0计算的合成重力扰动,进行了全球研究。对安第斯山脉地区进行了区域加密,因此在SRTM3地形模型的基础上,通过RTM效应对重力扰动进行了精化。这种分析是有效的标量自由和固定版本的GBVP同时,是基于高分辨率的数字高程模型(DEM),并表明,数字估计的影响,平面近似依赖于分辨率的DEM。数值研究证实了假设的相对误差为0.1%。这一假设意味着边界值的最大效应约为0.5 mGal,拟大地高的最大效应约为10 cm。
In the framework of the analytical treatment of the Geodetic Boundary Value Problem (GBVP) various approximations are necessary in order to end up with a solution in a “closed” form. Besides linearization and isotropic (“spherical”) approximation the socalled planar approximation has been introduced in the case of a non-spherical, topographic boundary surface. In this context the term “planar approximation” refers to neglecting terms proportional to the quotient of elevation and mean Earth radius in the respective kernel functions, not to confuse with approximating the boundary surface by a plane. In this paper the effect of planar approximation on the boundary condition of the fixed GBVP and on the disturbing potential is estimated. A global study is presented on the basis of synthesized gravity disturbances computed from the global geopotential model EGM2008 and the topography model DTM2006.0. A regional densification is carried out for the area of the Andes; therefore the gravity disturbances are refined by RTM-effects on the basis of the SRTM3 topography model. This analysis which is valid for the scalar free and the fixed versions of the GBVP simultaneously, is based on high-resolution digital elevation models (DEM) and shows that the numerical estimates of the effects of planar approximation depend on the resolution of the DEMs. The numerical investigations confirm the assumed relative error of the order 0.1%. This assumption implies a maximum effect of approximately 0.5 mGal for the boundary values and 10 cm for the quasigeoidal heights.
DOI: 10.1007/s001900050280
发表时间: 2000
期刊: Journal of Geodesy
影响因子: 4.4
作者:
Z. L. Fei;M. Sideris
通讯作者: M. Sideris
DOI: 10.1007/bf02526971
发表时间: 1964
期刊: Bulletin Géodésique (1946-1975)
影响因子: --
作者:
V. V. Brovar
通讯作者: V. V. Brovar
DOI: 10.1007/bf00815483
发表时间: 1995
期刊: Bulletin géodésique
影响因子: --
作者:
Ye Cai Li;M. Sideris;K. Schwarz
通讯作者: K. Schwarz
Untersuchungen zur planaren Approximation im Geodätischen Randwertproblem(KIT 科学报告;7652)
DOI: 10.5445/ksp/1000036407
发表时间: 2013
期刊: Bulletin géodésique
影响因子: --
作者:
Melanie Müssle;Bernhard Heck;K. Seitz;Thomas Grombein
通讯作者: Thomas Grombein
DOI: 10.1007/s00190-003-0317-6
发表时间: 2003
期刊: Journal of Geodesy
影响因子: 4.4
作者:
J. Huang;M. Véronneau;S. Pagiatakis
通讯作者: S. Pagiatakis