Evaluation of the GOCE-based gravity field models in Turkey

E. S. Ince; B. Erol; M. G. Sideris

doi:10.1007/978-3-319-10837-7_12

Evaluation of the GOCE-based gravity field models in Turkey

E. S. Ince^*, B. Erol, M. G. Sideris

^*Corresponding author for this work

Department of Geomatics Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

3 Citations (Scopus)

Abstract

The recent GOCE-based global gravity field models are tested in Turkey and in two sub-regions, the Istanbul and Sakarya territories, by means of geoid undulations. Global gravity field model computed geoid undulations are compared with different sets of GPS/leveling-derived geoid undulations for different spherical harmonic degree expansions. High frequency components of the geoid undulations are estimated from EGM2008 and are removed from the GPS/leveling-derived geoid undulations. Therefore, model-based and GPS/leveling-derived geoid undulations are reduced to about the same gravity spectral band. The comparisons between the two geoid undulations are performed directly on the same benchmark points and also between the benchmark points by means of geoid slope differences. The comparison results suggest that GOCE-based as well as GRACE and GOCE combined satellite-only models provide better agreement with GPS/levelingderived geoid than EGM2008 by up to a few centimeters for medium wavelength gravity components. Based on the results obtained in this study, current and upcoming satellitebased gravity models are expected to improve the regional geoid, as well as the regional gravity prediction from such models. Turkey is currently discussing the options for height system modernization. The investigations performed in this study will be useful for the height modernization project of Turkey and will help the development of an accurate geoid model and improvement of the current vertical datum in the regions.

Original language	English
Title of host publication	Gravity, Geoid and Height Systems - IAG Symposium GGHS2012, Proceedings
Editors	Urs Marti, Pascal Willis, Chris Rizos
Publisher	Springer Verlag
Pages	93-99
Number of pages	7
ISBN (Electronic)	9783319108360
DOIs	https://doi.org/10.1007/978-3-319-10837-7_12
Publication status	Published - 2014
Event	International Association of Geodesy Symposium on Gravity, Geoid and Height Systems, GGHS 2012 - Venice, Italy Duration: 9 Oct 2012 → 12 Oct 2012

Publication series

Name	International Association of Geodesy Symposia
Volume	141
ISSN (Print)	0939-9585

Conference

Conference	International Association of Geodesy Symposium on Gravity, Geoid and Height Systems, GGHS 2012
Country/Territory	Italy
City	Venice
Period	9/10/12 → 12/10/12

Bibliographical note

Publisher Copyright:
© Springer International Publishing Switzerland 2014.

Funding

This research was supported by grants from the GEOIDE NCE in Canada, and SERC in Turkey. The GPS/levelling data of sub-regions used in this study were provided by ITU, Geodesy Division. Figures presented in this paper were created by using the Generic Mapping Tools (GMT) and Matlab Tools.

Funders	Funder number
GEOIDE NCE
National Natural Science Foundation of China	30850004
Science and Engineering Research Council

Keywords

EGM2008
GOCE
Gravity field
Turkey geoid

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1007/978-3-319-10837-7_12

Cite this

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title = "Evaluation of the GOCE-based gravity field models in Turkey",

abstract = "The recent GOCE-based global gravity field models are tested in Turkey and in two sub-regions, the Istanbul and Sakarya territories, by means of geoid undulations. Global gravity field model computed geoid undulations are compared with different sets of GPS/leveling-derived geoid undulations for different spherical harmonic degree expansions. High frequency components of the geoid undulations are estimated from EGM2008 and are removed from the GPS/leveling-derived geoid undulations. Therefore, model-based and GPS/leveling-derived geoid undulations are reduced to about the same gravity spectral band. The comparisons between the two geoid undulations are performed directly on the same benchmark points and also between the benchmark points by means of geoid slope differences. The comparison results suggest that GOCE-based as well as GRACE and GOCE combined satellite-only models provide better agreement with GPS/levelingderived geoid than EGM2008 by up to a few centimeters for medium wavelength gravity components. Based on the results obtained in this study, current and upcoming satellitebased gravity models are expected to improve the regional geoid, as well as the regional gravity prediction from such models. Turkey is currently discussing the options for height system modernization. The investigations performed in this study will be useful for the height modernization project of Turkey and will help the development of an accurate geoid model and improvement of the current vertical datum in the regions.",

keywords = "EGM2008, GOCE, Gravity field, Turkey geoid",

author = "Ince, {E. S.} and B. Erol and Sideris, {M. G.}",

note = "Publisher Copyright: {\textcopyright} Springer International Publishing Switzerland 2014.; International Association of Geodesy Symposium on Gravity, Geoid and Height Systems, GGHS 2012 ; Conference date: 09-10-2012 Through 12-10-2012",

year = "2014",

doi = "10.1007/978-3-319-10837-7_12",

language = "English",

series = "International Association of Geodesy Symposia",

publisher = "Springer Verlag",

pages = "93--99",

editor = "Urs Marti and Pascal Willis and Chris Rizos",

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Ince, ES, Erol, B & Sideris, MG 2014, Evaluation of the GOCE-based gravity field models in Turkey. in U Marti, P Willis & C Rizos (eds), Gravity, Geoid and Height Systems - IAG Symposium GGHS2012, Proceedings. International Association of Geodesy Symposia, vol. 141, Springer Verlag, pp. 93-99, International Association of Geodesy Symposium on Gravity, Geoid and Height Systems, GGHS 2012, Venice, Italy, 9/10/12. https://doi.org/10.1007/978-3-319-10837-7_12

Evaluation of the GOCE-based gravity field models in Turkey. / Ince, E. S.; Erol, B.; Sideris, M. G.
Gravity, Geoid and Height Systems - IAG Symposium GGHS2012, Proceedings. ed. / Urs Marti; Pascal Willis; Chris Rizos. Springer Verlag, 2014. p. 93-99 (International Association of Geodesy Symposia; Vol. 141).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Sideris, M. G.

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PY - 2014

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N2 - The recent GOCE-based global gravity field models are tested in Turkey and in two sub-regions, the Istanbul and Sakarya territories, by means of geoid undulations. Global gravity field model computed geoid undulations are compared with different sets of GPS/leveling-derived geoid undulations for different spherical harmonic degree expansions. High frequency components of the geoid undulations are estimated from EGM2008 and are removed from the GPS/leveling-derived geoid undulations. Therefore, model-based and GPS/leveling-derived geoid undulations are reduced to about the same gravity spectral band. The comparisons between the two geoid undulations are performed directly on the same benchmark points and also between the benchmark points by means of geoid slope differences. The comparison results suggest that GOCE-based as well as GRACE and GOCE combined satellite-only models provide better agreement with GPS/levelingderived geoid than EGM2008 by up to a few centimeters for medium wavelength gravity components. Based on the results obtained in this study, current and upcoming satellitebased gravity models are expected to improve the regional geoid, as well as the regional gravity prediction from such models. Turkey is currently discussing the options for height system modernization. The investigations performed in this study will be useful for the height modernization project of Turkey and will help the development of an accurate geoid model and improvement of the current vertical datum in the regions.

AB - The recent GOCE-based global gravity field models are tested in Turkey and in two sub-regions, the Istanbul and Sakarya territories, by means of geoid undulations. Global gravity field model computed geoid undulations are compared with different sets of GPS/leveling-derived geoid undulations for different spherical harmonic degree expansions. High frequency components of the geoid undulations are estimated from EGM2008 and are removed from the GPS/leveling-derived geoid undulations. Therefore, model-based and GPS/leveling-derived geoid undulations are reduced to about the same gravity spectral band. The comparisons between the two geoid undulations are performed directly on the same benchmark points and also between the benchmark points by means of geoid slope differences. The comparison results suggest that GOCE-based as well as GRACE and GOCE combined satellite-only models provide better agreement with GPS/levelingderived geoid than EGM2008 by up to a few centimeters for medium wavelength gravity components. Based on the results obtained in this study, current and upcoming satellitebased gravity models are expected to improve the regional geoid, as well as the regional gravity prediction from such models. Turkey is currently discussing the options for height system modernization. The investigations performed in this study will be useful for the height modernization project of Turkey and will help the development of an accurate geoid model and improvement of the current vertical datum in the regions.

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Evaluation of the GOCE-based gravity field models in Turkey

Abstract

Publication series

Conference

Bibliographical note

Funding

Keywords

UN SDGs

Access to Document

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