Performance evaluation of high/ultra-high-degree global geopotential models over Vietnam using GNSS/leveling data

Pham, Hoa Thi; Claessens, Sten; Kühn, Michael; Awange, Joseph

doi:10.1016/j.geog.2023.03.002

Cited by 6 publications

(2 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Validating those combined and satellite-only GGMs in global, regional and local scales using external data such as terrestrial/airborne gravity data and geoid/quasigeoid heights from GNSS/levelling (Global Navigation Satellite System/levelling) data have been considered as a subject of investigation for the International Centre for Global Earth Models (ICGEM; Ince et al, 2019) and many other scholars (e.g. Godah and Kryński, 2013;Godah et al, 2014;Alothman et al, 2016;Odera and Fukuda, 2017;Godah et al, 2018a,b;Goyal et al, 2019;Odera, 2020;Wu et al, 2021;Yuan et al, 2022;Pham et al, 2023). Among these scholars, Yuan et al (2022) and Pham et al (2023) evaluated the Earth's gravity field up to spectral band of d/o 2190 from XGM2019e ultra high-resolution GGM.…”

Section: Introductionmentioning

confidence: 99%

“…Godah and Kryński, 2013;Godah et al, 2014;Alothman et al, 2016;Odera and Fukuda, 2017;Godah et al, 2018a,b;Goyal et al, 2019;Odera, 2020;Wu et al, 2021;Yuan et al, 2022;Pham et al, 2023). Among these scholars, Yuan et al (2022) and Pham et al (2023) evaluated the Earth's gravity field up to spectral band of d/o 2190 from XGM2019e ultra high-resolution GGM. However, so far there has been no investigation conducted to evaluate the XGM2019e ultra high resolution GGM at its maximum d/o (i.e.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Accuracy assessment of high and ultra high-resolution combined GGMs, and recent satellite-only GGMs – Case studies of Poland and Ethiopia

Godah,

Szelachowska,

Gedamu

2024

Reports on Geodesy and Geoinformatics

View full text Add to dashboard Cite

The launch of dedicated satellite gravity missions (CHAMP, GRACE, GOCE, and GRACE–FO), as well as the availability of gravity data from satellite altimetry and terrestrial/airborne gravity measurements have led to a growing number of Global Geopotential Models (GGMs) developed. Thus, the evaluation of GGMs is necessary to ensure their accuracy in recovering the Earth’s gravity field on local, regional, and global scales. The main objective of this research is to assess the accuracy of recent GGMs over Poland in Central Europe and Ethiopia in East Africa. Combined GGMs of high (degree and order (d/o) 2190) and ultra high-resolution (d/o 5540) as well as five satellite-only GGMs were evaluated using gravity data from absolute gravity measurements and airborne gravity surveys over Poland and Ethiopia, respectively. Based on this evaluation, the estimated accuracy of the high-resolution combined GGM is at the level of 2 mGal. The estimated accuracy for the ultra-high-resolution combined GGM is ~2.5 times lower. The satellite-only GGMs investigated recover the gravity signal at an accuracy level of 10 mGal and 26 mGal, for the areas of Poland and Ethiopia, respectively. When compensating for the omitted gravity signal using a high-resolution combined GGM and the topography model, an accuracy of 2 mGal can be achieved.

show abstract