A precise gravimetric geoid model in a mountainous area with scarce gravity data: a case study in central Turkey

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Abbak, Ramazan A. (author)

A precise gravimetric geoid model in a mountainous area with scarce gravity data : a case study in central Turkey

Article/chapterEnglish2012

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2012-01-31
Springer Science and Business Media LLC,2012
printrdacarrier

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LIBRIS-ID:oai:DiVA.org:kth-109578
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-109578URI
https://doi.org/10.1007/s11200-011-9001-0DOI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

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QC 20130108
In mountainous regions with scarce gravity data, gravimetric geoid determination is a difficult task that needs special attention to obtain reliable results satisfying the demands, e.g., of engineering applications. The present study investigates a procedure for combining a suitable global geopotential model and available terrestrial data in order to obtain a precise regional geoid model for Konya Closed Basin (KCB). The KCB is located in the central part of Turkey, where a very limited amount of terrestrial gravity data is available. Various data sources, such as the Turkish digital elevation model with 3 '' x 3 '' resolution, a recently published satellite-only global geopotential model from the Gravity Recovery and Climate Experiment satellite (GRACE) and the ground gravity observations, are combined in the least-squares sense by the modified Stokes' formula. The new gravimetric geoid model is compared with Global Positioning System (GPS)/levelling at the control points, resulting in the Root Mean Square Error (RMS) differences of +/- 6.4 cm and 1.7 ppm in the absolute and relative senses, respectively. This regional geoid model appears to he more accurate than the Earth Gravitational Model 2008, which is the best global model over the target area, with the RMS differences of +/- 8.6 cm and 1.8 ppm in the absolute and relative senses, respectively. These results show that the accuracy of a regional gravimetric model can be augmented by the combination of a global geopotential model and local terrestrial data in mountainous areas even though the quality and resolution of the primary terrestrial data are not satisfactory to the geoid modelling procedure.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Geofysik hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Geophysics hsv//eng
geoid
KTH method
Konya Closed Basin
least-squares modification
Stokes' formula

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Sjöberg, Lars E.KTH,Geodesi och geoinformatik(Swepub:kth)u1vvshm0 (author)
Ellmann, Artu (author)
Ustun, Aydin (author)
KTHGeodesi och geoinformatik (creator_code:org_t)

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In:Studia Geophysica et Geodaetica: Springer Science and Business Media LLC56:4, s. 909-9270039-31691573-1626

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By the author/editor: Abbak, Ramazan A ...; Sjöberg, Lars E.; Ellmann, Artu; Ustun, Aydin

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geophysics

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By the university: Royal Institute of Technology

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