A first step towards a national realisation of the international height reference system in Sweden with a comparison to RH 2000

IF 0.9 Q4 REMOTE SENSING
Anders Alfredsson, Jonas Ågren
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Abstract

Abstract The International Height Reference System (IHRS) was defined by the International Association of Geodesy in 2015. Since then, the international geodetic community has been working on the specification and establishment of its realisation, the International Height Reference Frame (IHRF). This frame will primarily be realised by geopotential numbers (or physical heights) in a sparse global reference network. In Sweden, only one such global station is planned. Regional and national realisations (or densifications) computed in accordance with the IHRS definition are needed to enable the best possible unification of height datums. The main purpose of this article is to make a case study for Sweden regarding the national realisation of IHRS and to investigate in what way preliminary IHRF differs from the current Swedish levelling-based realisation of the European Vertical Reference System, RH 2000. The two different quasigeoid models that we consider best over Sweden at the present time are used to compute the preliminary IHRS realisations in the study. The realisations are compared to each other and to RH 2000. It is shown that a very significant part of the difference to RH 2000 is due to the different postglacial land uplift epochs, permanent tide concepts, and zero levels. The standard deviation for the difference between one of the preliminary national IHRS realisations and RH 2000 is reduced from 75.5 to 19.2 mm after correction of the postglacial land uplift and permanent tide effects. The corresponding mean differences are –208.5 and –454.7 mm, respectively. The magnitude of the mean difference thus increases when the corrections in question are applied.
瑞典朝着实现国际高度参考系统迈出的第一步,并与2000年的RH进行了比较
国际高程基准系统(IHRS)是由国际大地测量学协会于2015年确定的。从那时起,国际大地测量界一直致力于规范和建立其实现,即国际高度参考系(IHRF)。该框架将主要通过稀疏全局参考网络中的地理位势数(或物理高度)来实现。在瑞典,只有一个这样的全球站计划。需要根据IHRS定义计算的区域和国家实现(或密度),以实现高度基准的最佳统一。本文的主要目的是为瑞典就IHRS的国家实现进行案例研究,并调查初步的IHRF与目前瑞典基于水平的欧洲垂直参考系统(RH 2000)的实现有何不同。我们认为目前在瑞典最好的两种不同的拟面模型用于计算研究中初步的IHRS实现。将实现相互比较并与rh2000进行比较。结果表明,与2000年的差异有很大一部分是由于不同的冰川后陆地隆升时代、永久潮汐概念和零水平。在对冰川后陆地隆起和永久潮汐效应进行校正后,一个初步的国家IHRS实现与2000年RH之间的差异的标准差从75.5 mm减小到19.2 mm。相应的平均差值分别为-208.5 mm和-454.7 mm。因此,当应用所讨论的修正时,平均差的幅度增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Geodetic Science
Journal of Geodetic Science REMOTE SENSING-
CiteScore
1.90
自引率
7.70%
发文量
3
审稿时长
14 weeks
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