A unified global height reference system as a basis for IGGOS

Ihde, J.; Sánchez, Laura

doi:10.1016/j.jog.2005.06.015

Cited by 33 publications

(19 citation statements)

References 18 publications

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“…Such a system provides all of the data necessary to convert between different height systems (Ihde & Sánchez, 2005). A proposal for the Association of Southeast Asian Nations (ASEAN) assesses an accuracy of 13 cm for distances of 500 km and assumes a higher accuracy for shorter distances (Lan, 2009).…”

Section: Discussionmentioning

confidence: 99%

Reprint of: Requirements of 3D cadastres for height systems

Navratil

Unger

2013

Computers, Environment and Urban Systems

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Section: Discussionmentioning

confidence: 99%

Reprint of: Requirements of 3D cadastres for height systems

Navratil

Unger

2013

Computers, Environment and Urban Systems

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“…Then the potential of the LVD, W j 0 , is computed by adding the W 0 to the computed potential difference δW j . Thus, the approximately one hundred existing LVDs can be connected to a unified vertical datum by means of a global geoid model with the potential W 0 (e.g., [18]). A single unified vertical datum will provide a reference surface for monitoring the solid and fluid Earth and will enable the connection between the geometric and gravity reference frames.…”

Section: Introductionmentioning

confidence: 99%

North American height datums and their offsets: The effect of GOCE omission errors and systematic levelling effects

Amjadiparvar

Rangelova

Sideris

et al. 2013

Journal of Applied Geodesy

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One of the main scientific objectives of the Gravity field and steady state Ocean Circulation Explorer (GOCE) gravity field satellite mission is its contribution to the global unification of height systems. In this study, we compute the offsets of three height datums in North America (NAVD88, CGVD28 and Nov07) against a common equipotential surface. NAVD88 and CGVD28 are the official vertical datums for the USA and Canada, respectively. Nov07 is the latest unofficial adjustment of the first-order levelling network in Canada. This datum is only used for the validation of geoid models. The offset for each datum is determined from a combination of ellipsoidal, orthometric and geoid heights. The ellipsoidal heights on benchmarks come from the GNSS networks of Canada and the USA while geoid heights are computed from currently the best GOCE-based geopotential model in North America, i.e., go_cons_gcf_2_tim_r3. The orthometric heights of the GNSS stations are available from the adjustments of the vertical control networks of both countries. Among the various factors that contribute to the uncertainty of the computed datum offset, we investigate the effect of the omission error of the GOCE geoid by means of the EGM2008 model. In Canada, where GNSS/levelling stations are irregularly distributed over the landmass, the effect of the GOCE omission error on the computed offsets reaches one decimetre. Due to the much more densely distributed GNSS/levelling stations in the USA, the effect of the GOCE omission error on the offset of NAVD88 is 3 cm. Therefore, the effect of the omission error of GOCE-based geopotential models should be taken into account in the height datum unification on the North American continent if we aim at the one centimetre accuracy.

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“…However, in this paper we have the interest in vertical datums unification to a World Height System (WHS), cf. Ihde and Sánchez (2005). Following Rummel (2002), the main point for connecting two vertical datums is to determine their potential difference at a datum point or along the mean offset in the network, which implies in height difference between them.…”

Section: Introductionmentioning

confidence: 99%

An attempt to link the Brazilian Height System to a World Height System

Ferreira

Freitas

2012

Bol. Ciênc. Geod.

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This paper deals with the geopotential approach to investigate the present Brazilian Height System (BHS). Geopotential numbers are derived from Global Positioning System (GPS) satellite surveying and disturbing potential on selected benchmarks. A model for the disturbing potential can be obtained by an existing set of spherical harmonic coefficients such as the Earth Gravity Model 2008 (EGM08). The approach provides absolute evaluation of local normal geopotential numbers (aka spheropotential numbers) related to a so-called World Height System (WHS). To test the validity of the proposed methodology, a numerical experiment was carried out related to a test region in Southern Brazil. The accuracy of the derived geopotential numbers was tested versus local normal geopotential numbers based on 262 GPS/leveling points. The root mean square error (RMSE) value for metric offset of BHS derived from geopotential numbers and the disturbing potential modeling in the test area was estimated to be near 0.224 meters in the absolute view. Therefore, since these spheropotential numbers are referred to a local datum, these results of comparisons may be an indicator of the mean bias of local network due to the effect of local Sea Surface Topography (SSTop) and possible offset between the unknown reference for the BHS and the quasigeoid model in the region. Keywords: Geopotential Numbers; Vertical Datum Connections; NormalOrthometric Heights; Quasigeoid.An attempt to link the Brazilian height system to a world height system. Bol. Ciênc. Geod., sec. Artigos, Curitiba, v. 18, n o 3, p.363-377, jul-set, 2012.3 6 4 RESUMO Este trabalho apresenta uma investigação realizada a respeito da Rede Altimétrica Fundamental do Brasil (RAFB) com base em posicionamento GPS (Global Positioning System) e determinação do distúrbio do potencial sobre referências de nível. Um modelo para o distúrbio do potencial pode ser obtido com base nos coeficientes do desenvolvimento em séries de funções harmônicas esféricas do potencial gravitacional como os do Earth Gravity Model 2008 (EGM08) por exemplo. A abordagem provê a base para avaliação absoluta de números geopotenciais normais (ou números esferopotencias) locais relativamente a um Sistema Global de Altitudes (SGA). Para verificar a validade desta metodologia proposta um experimento numérico foi desenvolvido em relação a uma área teste no sul do Brasil. As acurácias dos números geopotenciais obtidos foram testadas em relação a números geopotenciais normais com base em 262 pontos GPS sobre a rede de nivelamento. O valor do erro médio quadrático (EMQ) em termos de um desvio métrico absoluto do Sistema Altimétrico Brasileiro (SAB) obtido a partir dos números geopotenciais e do distúrbio do potencial na área teste foi estimado em cerca de 0,224 metros. Uma vez que os números esferopotenciais são referidos ao datum local, os resultados das comparações efetivadas podem ser um indicador do desvio da rede local em vista da topografia do nível médio do mar (TNMM) e a possível inconsistência entre a orige...

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A unified global height reference system as a basis for IGGOS

Cited by 33 publications

References 18 publications

Reprint of: Requirements of 3D cadastres for height systems

Reprint of: Requirements of 3D cadastres for height systems

North American height datums and their offsets: The effect of GOCE omission errors and systematic levelling effects

An attempt to link the Brazilian Height System to a World Height System

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