On the contribution of dedicated gravity satellite missions to the modelling of the Earth gravity field ‒ A case study of Ethiopia and Uganda in East Africa

• Autorzy: Godah Walyeldeen , Gedamu Andenet A. , Bedada Tulu B.

Warianty tytułu

PL

Udział grawimetrycznych misji satelitarnych w modelowaniu ziemskiego pola siły ciężkości – badanie dla obszaru Etiopii i Ugandy w Afryce Wschodniej

• Języki publikacji: EN

Abstrakty

EN

Since the first decade of this millennium, the three dedicated gravity satellite missions (DGSMs): CHAMP (Challenging Minisatellite Payload), GRACE (Gravity Recovery and Climate Experiment) and GOCE (Gravity field and steady-state Ocean Circulation Explorer) had remarkably contributed to the modelling of the Earth’s gravity field and its temporal variations. Moreover, in 22 May 2018, the GRACE-FO (GRACE Follow-On) has been launched to continue the measurements of GRACE satellite mission. On the basis of data from those DGSMs, Global Geopotential Models (GGMs) are continuously developed. The main aim of this research is to evaluate the recent GGMs and assess the contribution of DGSMs to the modelling of the Earth’s gravity field over East Africa. Gravity functionals, e.g. quasigeoid height and gravity disturbance, obtained from recent GGMs developed with the use of data from DGSMs were evaluated using terrestrial gravity data available in Ethiopia and GNSS/levelling data in Uganda. The results obtained were analysed and discussed. The main findings reveal an improvement of ca. 40–50% on the modelled gravity field from GGMs that include data from GOCE satellite mission.

PL

Od pierwszej dekady obecnego tysiąclecia do poprawy modelowania pola siły ciężkości Ziemi oraz jego zmian w czasie przyczyniły się ogromnie trzy grawimetryczne misje satelitarne: CHAMP (Challenging Minisatellite Payload), GRACE (Gravity Recovery and Climate Experiment) oraz GOCE (Gravity field and steady-state Ocean Circulation Explorer). Ponadto w maju 2018 roku zostały wystrzelone satelity misji GRACE-FO (GRACE Follow-On) kontynuującej dostarczanie danych pomiarowych otrzymywanych z misji GRACE. Na podstawie tych danych są stale opracowywane globalne modele geopotencjału. Głównym celem podjętych w niniejszej pracy badań jest ocena wygenerowanych w ostatnich kilku latach globalnych modeli geopotencjału oraz oszacowanie wpływu grawimetrycznych misji satelitarnych na modelowanie pola siły ciężkości Ziemi dla obszaru Etiopii i Ugandy w Afryce Wschodniej. Z globalnych modeli geopotencjału opracowanych na podstawie danych z grawimetrycznych misji satelitarnych, wyznaczono funkcjonały pola siły ciężkości, tj. zakłócenie grawimetryczne i wysokość quasigeoidy, a następnie porównano je z dostępnymi lotniczymi/naziemnymi danymi grawimetrycznymi dla obszaru Etiopii oraz danymi satelitarno-niwelacyjnymi dla obszaru Ugandy. Uzyskane wyniki poddano analizie i dyskusji. Zaobserwowano poprawę dokładności modelowanego ziemskiego pola siły ciężkości o ok. 40–50% w przypadku wykorzystania globalnych modeli geopotencjału opracowanych z użyciem danych z misji satelitarnej GOCE.

Słowa kluczowe

EN

East Africa; global geopotential model; gravity functionals; dedicated gravity satellite mission

PL

Afryka Wschodnia; globalny model geopotencjału; funkcjonał pola siły ciężkości; grawimetryczna misja satelitarna

• Wydawca: Instytut Geodezji i Kartografii
• Czasopismo: Geoinformation Issues
• Rocznik: 2018
• Tom: Vol. 10, no. 1(10)
• Strony: 5--15
• Opis fizyczny: Bibliogr. 40 poz., rys., tab., wykr.

Twórcy

autor

Godah Walyeldeen

• Institute of Geodesy and Cartography, 27 Modzelewskiego St., 02-679, Warsaw, Poland, Tel.: [phone], Fax: [phone], ORCID: https://orcid.org/0000-0002-5616-0770

autor

Gedamu Andenet A.

• Addis Ababa University, Addis Ababa Institute of Technology, School of Civil and Environmental Engineering, Addis Ababa, Ethiopia, Tel.: [phone]; Entoto Observatory and Research Centre, Ethiopian Space Science and Technology Institute, Addis Ababa, Ethiopia, ORCID: https://orcid.org/0000-0001-6708-6505

autor

Bedada Tulu B.

• Entoto Observatory and Research Centre, Ethiopian Space Science and Technology Institute, Addis Ababa, Ethiopia; Geospatial Information Institute, Addis Ababa, Ethiopia, Tel.: [phone], Fax: [phone], ORCID: https://orcid.org/0000-0003-0168-8786

Bibliografia

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).