Optimal combination of satellite and terrestrial gravity data for regional geoid determination using Stokes-Helmert’s method, the Auvergne test case

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F17%3A43933133" target="_blank" >RIV/49777513:23520/17:43933133 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1007/1345_2017_22" target="_blank" >https://doi.org/10.1007/1345_2017_22</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/1345_2017_22" target="_blank" >10.1007/1345_2017_22</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Optimal combination of satellite and terrestrial gravity data for regional geoid determination using Stokes-Helmert’s method, the Auvergne test case

Popis výsledku v původním jazyce

The precise regional geoid modelling requires combination of terrestrial gravity data with satellite-only Earth Gravitational Models (EGMs). In determining the geoid using the Stokes-Helmert approach, the relative contribution of terrestrial and satellite data to the computed geoid can be specified by the Stokes integration cap size defined by the spherical distance and the maximum degree of the EGM-based reference spheroid. Larger values of the degree decrease the role of terrestrial gravity data and increase the contribution of satellite data and vice versa for larger values of the integration radius. The determination of the optimal combination of the two parameters and is numerically investigated in this paper. A numerical procedure is proposed to find the best geoid solution by comparing derived gravimetric geoidal heights with those at GNSS/levelling points. The proposed method is tested over the Auvergne geoid computation area. The results show that despite the availability of recent satellite-only EGMs with the maximum degree/order 300, the combination of the degree 160 and radius of 45 arc-min yields the best fitting geoid in terms of the standard deviation and the range of the differences between the estimated gravimetric and GNSS/levelling geoidal heights. Depending on the accuracy of available ground gravity data and reference geoidal heights at GNSS/levelling points, the optimal combination of these two parameters may be different in other regions.

Název v anglickém jazyce

Optimal combination of satellite and terrestrial gravity data for regional geoid determination using Stokes-Helmert’s method, the Auvergne test case

Popis výsledku anglicky

The precise regional geoid modelling requires combination of terrestrial gravity data with satellite-only Earth Gravitational Models (EGMs). In determining the geoid using the Stokes-Helmert approach, the relative contribution of terrestrial and satellite data to the computed geoid can be specified by the Stokes integration cap size defined by the spherical distance and the maximum degree of the EGM-based reference spheroid. Larger values of the degree decrease the role of terrestrial gravity data and increase the contribution of satellite data and vice versa for larger values of the integration radius. The determination of the optimal combination of the two parameters and is numerically investigated in this paper. A numerical procedure is proposed to find the best geoid solution by comparing derived gravimetric geoidal heights with those at GNSS/levelling points. The proposed method is tested over the Auvergne geoid computation area. The results show that despite the availability of recent satellite-only EGMs with the maximum degree/order 300, the combination of the degree 160 and radius of 45 arc-min yields the best fitting geoid in terms of the standard deviation and the range of the differences between the estimated gravimetric and GNSS/levelling geoidal heights. Depending on the accuracy of available ground gravity data and reference geoidal heights at GNSS/levelling points, the optimal combination of these two parameters may be different in other regions.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10508 - Physical geography

Projekt

<a href="/cs/project/GA15-08045S" target="_blank" >GA15-08045S: Metody validace, zpracování a použití dat družicových misí v geodézii a geofyzice</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

International Symposium on Gravity, Geoid and Height Systems 2016. International Association of Geodesy Symposia

ISBN

978-3-319-95317-5

ISSN

0939-9585

e-ISSN

2197-9359

Počet stran výsledku

7

Strana od-do

37-43

Název nakladatele

Springer Nature Switzerland AG

Místo vydání

Cham, Switzerland

Místo konání akce

Thessaloniki, Greece

Datum konání akce

19. 9. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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