Results 181 to 190 of about 2,632 (195)

Global Crust-Mantle Density Contrast Estimated from EGM2008, DTM2008, CRUST2.0, and ICE-5G

Pure and Applied Geophysics, 2011
We compute globally the consolidated crust-stripped gravity disturbances/anomalies. These refined gravity field quantities are obtained from the EGM2008 gravity data after applying the topographic and crust density contrasts stripping corrections computed using the global topography/bathymetry model DTM2006.0, the global continental ice-thickness data ...
Robert Tenzer, null Hamayun, Pavel Novák, Vladislav Gladkikh, Peter Vajda   +4 more
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Evaluation of EGM2008 Within Geopotential Space from GPS, Tide Gauges and Altimetry

2011
The new global Earth gravitational model EGM2008 has been evaluated within geopotential space by comparison with its predecessor EGM96 and the GRACE combination model EIGEN-GL04C. The methodology comprises establishing geodetic coordinates of mean sea level (MSL) from GPS observations, tide gauge (TG) time series and levelling. The gravity potential at
N. Dayoub, P. Moore, N. T. Penna, S. J. Edwards   +3 more
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Assessment of Orthometric Height Derived from Levelling, GNSS and EGM2008 Geoid Model in Bangladesh

2020 15th IEEE International Conference on Signal Processing (ICSP), 2020
The use of GNSS to determine the orthometric height requires a geoid model which is used as a transformation linkage between ellipsoidal height and orthometric height. GNSS derived ellipsoidal height is purely mathematical, having no physical meaning. So, in most of the geodetic applications, it is necessary to use physically defined orthometric height.
Muhammad Abdul Alim Sikder, Falin Wu, Wasiu Akande Ahmed, Thippawan Thodsan, Yan Zhao   +4 more
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Analyse des globalen Geopotentialmodells EGM2008 und des Europ��ischen Geoids EGG08

2014
There are several gravitational models for geodetic, geophysical or oceanographic applications and investigations. Usually these are spherical harmonic models of the Earth-s gravitational potential, which are developed by a combination of satellite tracking data, satellite altimeter data and gridded mean free-air anomalies. More detailed regional geoid
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Testing EGM2008 on Leveling Data from Scandinavia, Adjacent Baltic Areas, and Greenland

2010
We tested EGM2008 on GPS/leveling data from Scandinavia and adjacent areas. EGM2008 performs at the same level as the best regional geoid model, NKG2004. However, the direct evaluation of EGM2008 is difficult in Greenland because no leveling data are available. Nevertheless, we show on 78 GPS-MSS data that EGM2008 also performs at the same level as the
G. Strykowski, R. Forsberg
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Evaluation of the Performance of the New EGM2008 Global Geopotential Model over Poland

2009
The performance of the new EGM2008 global geopotential model, over Poland, has been evaluated. The tide-free release of the EGM2008 model was also used for the assessment of quality of three precise quasigeoid models developed in the last decade in Poland.
Krynski, Jan, Kloch-Główka, Grażyna
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The Progress of the Geoid Model for South America Under GRACE and EGM2008

2011
The efforts to compute the geoid model for South America, limited by 15° N and 57° S in latitude and 30° W and 95° W in longitude, are presented. The terrestrial gravity data for the continent have been updated with the most recent measurements in Argentina, Brazil, Chile, Ecuador and Paraguay.
D. Blitzkow, A. C. O. C. de Matos, J. D. Fairhead, M. C. Pacino, M. C. B. Lobianco, I. O. Campos   +5 more
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Evaluation of EGM2008 by Comparison with Global and Local Gravity Solutions from CHAMP

2010
New gravity field models incorporate GRACE data for the long wavelengths since it is one of the best available data sources. However, considering e.g. the degree difference RMS between EGM2008 and GGM02s, also discrepancies between these models occur which cannot solely be explained by numerical inaccuracies.
M. Weigelt, N. Sneeuw, W. Keller
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Estimation Of Orthometric Height Using EGM2008 and GPS Over Nairobi County and Its Environs

Journal of Agriculture, Science and Technology, 2017
Global Navigation Satellite Systems (GNSS) have been used widely in 3-dimensional positioning globally, regionally and locally. Global Positioning System (GPS) is one of the most extensively used GNSS in Earth sciences. GPS which employs World Geodetic System adopted in 1984 (WGS84) as the reference system has extensively been used for height ...
K. E. Kemboi, P. A. Odera
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بهبود مدل پوسته فلات ایران با استفاده از بی‌هنجاری بوگه مدل EGM2008

2013
با ظهور فناوری گرانی‌سنجی ماهواره‌‌ای، امکان محاسبه درجات بالای ضرایب ژئوپتانسیل و در نتیجه دسترسی به میدان گرانی با قدرک تفکیک مکانی زیاد میسر شده است. مدل ژئوپتانسیل EGM2008 با ضرایب بسط تا درجه 2190 معادل قدرت تفکیک مکانی حدود 10 کیلومتر، کاربردهای فراوانی در بررسی‌های میدان گرانی زمین دارد.
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