W-0 Estimates in the Frame of the GGOS Working Group on Vertical Datum Standardisation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F14%3A00481944" target="_blank" >RIV/67985815:_____/14:00481944 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26110/14:PU117621

Výsledek na webu

<a href="http://dx.doi.org/10.1007/978-3-319-10837-7_26" target="_blank" >http://dx.doi.org/10.1007/978-3-319-10837-7_26</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/978-3-319-10837-7_26" target="_blank" >10.1007/978-3-319-10837-7_26</a>

Jazyk výsledku

angličtina

Název v původním jazyce

W-0 Estimates in the Frame of the GGOS Working Group on Vertical Datum Standardisation

Popis výsledku v původním jazyce

During the 2011 IUGG General Assembly, GGOS, the IAG Commissions 1 (Reference Frames) and 2 (Gravity Field) and the IGFS established a joint working group devoted to the Vertical Datum Standardisation. This working group supports the activities of GGOS Theme 1 Unified Height System, in particular, to recommend a reliable geopotential value W-0 to be introduced as the conventional reference level for the realisation of the GGOS Vertical Reference System. At present, the most commonly accepted W-0 value corresponds to the best estimate available in 2004. This value presents discrepancies of about 2 m(2) s(-2) with respect to recent computations based on the latest Earth's surface and gravity field models. According to this, as a first approach, four different teams working on the computation of a global W-0 value were brought together in order to compare methodologies and models, and to establish the reliability of the individual computations. Results of this comparison show that the four individual estimates present a maximum discrepancy of about 0.5 m(2) s(-2). They also confirm that the W-0 value declared as the best estimate in 2004 corresponds to an equipotential surface located about 17 cm beneath the sea surface scanned by satellite altimetry, while the potential value U-0 of the GRS80 ellipsoid realises an equipotential surface located about 67 cm lower. In this context, the need to provide a new better estimate of W-0 is evident.

Název v anglickém jazyce

W-0 Estimates in the Frame of the GGOS Working Group on Vertical Datum Standardisation

Popis výsledku anglicky

During the 2011 IUGG General Assembly, GGOS, the IAG Commissions 1 (Reference Frames) and 2 (Gravity Field) and the IGFS established a joint working group devoted to the Vertical Datum Standardisation. This working group supports the activities of GGOS Theme 1 Unified Height System, in particular, to recommend a reliable geopotential value W-0 to be introduced as the conventional reference level for the realisation of the GGOS Vertical Reference System. At present, the most commonly accepted W-0 value corresponds to the best estimate available in 2004. This value presents discrepancies of about 2 m(2) s(-2) with respect to recent computations based on the latest Earth's surface and gravity field models. According to this, as a first approach, four different teams working on the computation of a global W-0 value were brought together in order to compare methodologies and models, and to establish the reliability of the individual computations. Results of this comparison show that the four individual estimates present a maximum discrepancy of about 0.5 m(2) s(-2). They also confirm that the W-0 value declared as the best estimate in 2004 corresponds to an equipotential surface located about 17 cm beneath the sea surface scanned by satellite altimetry, while the potential value U-0 of the GRS80 ellipsoid realises an equipotential surface located about 67 cm lower. In this context, the need to provide a new better estimate of W-0 is evident.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Gravity, Geoid and Height Systems

ISBN

978-3-319-10836-0

ISSN

0939-9585

e-ISSN

—

Počet stran výsledku

8

Strana od-do

203-210

Název nakladatele

Springer

Místo vydání

New Yourk

Místo konání akce

Venice

Datum konání akce

9. 10. 2012

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000358612900026