Use of the topographic deflections of the vertical for computation of the quasigeoid

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F20%3APU136285" target="_blank" >RIV/00216305:26110/20:PU136285 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.taylorfrancis.com/books/e/9780429327025" target="_blank" >https://www.taylorfrancis.com/books/e/9780429327025</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1201/9780429327025" target="_blank" >10.1201/9780429327025</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Use of the topographic deflections of the vertical for computation of the quasigeoid

Popis výsledku v původním jazyce

The aim of this study is to open the possibility to substitute the gravimetric deflections of the vertical with the topographic ones in some cases. The topographic deflections of the vertical have a great advantage in the data availability for the calculation compared to the gravimetric ones. The detailed gravimetric data for the gravimetric deflections of the vertical calculation are not commonly accessible in many countries. On the contrary, topographic deflections of the vertical can be computed from the global digital elevation model with high resolution, for example SRTM (Shuttle Radar Topography Mission), or GMTED2010 (Global Multi-resolution Terrain Elevation Data 2010). These models are freely available. The profile of Velká Bíteš – Brno – Uherské Hradiště in Czech Republic was chosen as the test area. There are mountainous as well as flat areas on the profile route. There is the greatest gradient of the height anomaly of the Czech Republic in this area. The profile consists of 581 points. On these points, three different types of deflections of the vertical were computed: gravimetric, topographic and deflections from the geopotential model EGM2008. The astrogeodetic deflections of the vertical were measured on 30 evenly distributed points of the profile and the GNSS/levelling was performed on 15 points of the profile. The terrain model GMDET2010 was chosen for the calculation of the topographic deflections of the vertical. The topographic deflections of the vertical were fitted on the deflections calculated from EGM2008. The fitted topographic deflections were compared with the gravimetric deflections, after that, the quasigeoid separation (height anomalies) on the profile was computed using the astronomical levelling method. The root mean square error of the differences between the gravimetric and the fitted topographic deflections of the vertical is 0.53’’ in the meridian component ξ and 0.69’’ in the prime-vertical component η. The root mean square error

Název v anglickém jazyce

Use of the topographic deflections of the vertical for computation of the quasigeoid

Popis výsledku anglicky

The aim of this study is to open the possibility to substitute the gravimetric deflections of the vertical with the topographic ones in some cases. The topographic deflections of the vertical have a great advantage in the data availability for the calculation compared to the gravimetric ones. The detailed gravimetric data for the gravimetric deflections of the vertical calculation are not commonly accessible in many countries. On the contrary, topographic deflections of the vertical can be computed from the global digital elevation model with high resolution, for example SRTM (Shuttle Radar Topography Mission), or GMTED2010 (Global Multi-resolution Terrain Elevation Data 2010). These models are freely available. The profile of Velká Bíteš – Brno – Uherské Hradiště in Czech Republic was chosen as the test area. There are mountainous as well as flat areas on the profile route. There is the greatest gradient of the height anomaly of the Czech Republic in this area. The profile consists of 581 points. On these points, three different types of deflections of the vertical were computed: gravimetric, topographic and deflections from the geopotential model EGM2008. The astrogeodetic deflections of the vertical were measured on 30 evenly distributed points of the profile and the GNSS/levelling was performed on 15 points of the profile. The terrain model GMDET2010 was chosen for the calculation of the topographic deflections of the vertical. The topographic deflections of the vertical were fitted on the deflections calculated from EGM2008. The fitted topographic deflections were compared with the gravimetric deflections, after that, the quasigeoid separation (height anomalies) on the profile was computed using the astronomical levelling method. The root mean square error of the differences between the gravimetric and the fitted topographic deflections of the vertical is 0.53’’ in the meridian component ξ and 0.69’’ in the prime-vertical component η. The root mean square error

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10508 - Physical geography

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název statě ve sborníku

Advances and Trends in Geodesy, Cartography and Geoinformatics II

ISBN

978-0-367-34651-5

ISSN

—

e-ISSN

—

Počet stran výsledku

6

Strana od-do

123-128

Název nakladatele

CRC Press/Balkema

Místo vydání

London

Místo konání akce

Demänovská dolina

Datum konání akce

10. 9. 2019

Typ akce podle státní příslušnosti

CST - Celostátní akce

Kód UT WoS článku

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