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Geodesy and Cartography

The Journal of Committee on Geodesy of Polish Academy of Sciences

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Accuracy assessment of GOCE-based geopotential models and their use for modelling the gravimetric quasigeoid - A case study for Poland

Walyeldeen Godah
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  • University of Khartoum Department of Surveying Engineering AL-Jama’a St., 321-11115 Khartoum, Sudan
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/ Malgorzata Szelachowska
  • Institute of Geodesy and Cartography Department of Geodesy and Geodynamics 27 Modzelewskiego St., 02-679 Warsaw, Poland
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/ Jan Krynski
  • Institute of Geodesy and Cartography Department of Geodesy and Geodynamics 27 Modzelewskiego St., 02-679 Warsaw, Poland
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Published Online: 2014-06-13 | DOI: https://doi.org/10.2478/geocart-2014-0001

Abstract

The GOCE (Gravity Field and Steady-State Ocean Circulation Explorer) has significantly upgraded the knowledge on the Earth gravity field. In this contribution the accuracy of height anomalies determined from Global Geopotential Models (GGMs) based on approximately 27 months GOCE satellite gravity gradiometry (SGG) data have been assessed over Poland using three sets of precise GNSS/levelling data. The fits of height anomalies obtained from 4th release GOCE-based GGMs to GNSS/levelling data were discussed and compared with the respective ones of 3rd release GOCE-based GGMs and the EGM08.

Furthermore, two highly accurate gravimetric quasigeoid models were developed over the area of Poland using high resolution Faye gravity anomalies. In the first, the GOCE-based GGM was used as a reference geopotential model, and in the second - the EGM08. They were evaluated with GNSS/levelling data and their accuracy performance was assessed. The use of GOCE-based GGMs for recovering the long-wavelength gravity signal in gravimetric quasigeoid modelling was discussed.

Streszczenie

Misja GOCE (Gravity Field and Steady-State Ocean Circulation Explorer) przyczyniła się do znacznego poprawienia znajomości pola siły ciężkości Ziemi. W artykule przedstawiono wyniki oszacowania dokładności anomalii wysokości, wyznaczonych z globalnych modeli geopotencjału opracowanych na podstawie blisko 27 miesięcy pomiarów z satelitarnej misji gradiometrycznej GOCE. Do oszacowania wykorzystano trzy zbiory dokładnych danych satelitarno-niwelacyjnych z obszaru Polski. Omówiono wyniki wpasowania wartości anomalii wysokości otrzymanych z czwartej wersji globalnych modeli geopotencjału wyznaczonych na podstawie danych misji GOCE do danych satelitarno-niwelacyjnych oraz porównano je z wynikami odpowiedniego wpasowania trzeciej wersji globalnych modeli geopotencjału otrzymanych z GOCE oraz z modelu EGM08.

Ponadto, wykorzystując wysokorozdzielczy zbiór grawimetrycznych anomalii Faye’a, wyznaczono dla obszaru Polski dwa grawimetryczne modele quasigeoidy o wysokiej dokładności. W pierwszym przypadku jako model referencyjny użyto model utworzony na podstawie danych z misji GOCE, w drugim - model EGM08. Wygenerowane modele quasigeoidy porównano z danymi satelitarno-niwelacyjnymi oraz oszacowano ich dokładność. Omówiono przydatność otrzymanych na podstawie danych z misji GOCE globalnych modeli geopotencjału do odtworzenia długofalowego sygnału grawimetrycznego przy modelowaniu grawimetrycznej quasigeoidy.

Keywords: global geopotential model; GNSS/levelling; GOCE; least squares collocation; quasigeoid; height anomaly

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About the article

Received: 2014-02-01

Accepted: 2014-04-17

Published Online: 2014-06-13

Published in Print: 2014-06-01


Citation Information: Geodesy and Cartography, ISSN (Online) 2300-2581, ISSN (Print) 2080-6736, DOI: https://doi.org/10.2478/geocart-2014-0001.

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© by Walyeldeen Godah. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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