نتایج جستجو برای: gravity acceleration observation and satellite altimetry data

تعداد نتایج: 17078706  

Journal: :فیزیک زمین و فضا 0
مهدی خاکی دانشجوی کارشناسی ارشد ژئودزی گروه مهندسی نقشه برداری، پردیس دانشکده های فنی دانشگاه تهران احسان فروتن محقق ژئودزی گروه ژئودزی و اطلاعات زمینی، دانشگاه بن محمد علی شریفی استادیار گروه مهندسی نقشه برداری، پردیس دانشکده های فنی دانشگاه تهران عبدالرضا صفری دانشیار گروه مهندسی نقشه برداری، پردیس دانشکده های فنی دانشگاه تهران

monitoring of water levels within the seas and oceans has been enhanced by application of satellite radar altimetry missions, compared to the traditional in-situ tide gauge measurements, due to their vast coverage and better spatial resolution. satellite radar altimetry, which is originally designed to measure global ocean surface height, has been applied to inland surface water hydrologic stud...

2018
Ingo Sasgen Alba Martín-Español Alexander Horvath Volker Klemann Elizabeth J. Petrie Bert Wouters Martin Horwath Roland Pail Jonathan L. Bamber Peter J. Clarke Hannes Konrad Terry Wilson Mark R. Drinkwater

The poorly known correction for the ongoing deformation of the solid Earth caused by glacial isostatic adjustment (GIA) is a major uncertainty in determining the mass balance of the Antarctic ice sheet from measurements of satellite gravimetry and to a lesser extent satellite altimetry. In the past decade, much progress has been made in consistently modeling ice sheet and solid Earth interactio...

2003
J. Kusche

Precise orbit determination, and satellite-geodetic applications such as gravity field modelling or satellite altimetry, rely on different observation types and groups that have to be processed in a common parameter estimation scheme. Naturally, the choice of the relative weights for these data sets as well as for added prior information is of importance for obtaining reliable estimates of the ...

2008
Xiaotao Chang Chuanyin Zhang Hanjiang Wen Jiancheng Li

Satellite altimetry has become an operational remote sensing technique with important applications to geodynamics. In the present paper, ocean floor topography and tectonic detection in the deep earth are investigated using gravity anomalies from global gravity models and satellite altimetry corrected for waveform distortions. We compute the spherical harmonic degree components of the gravity a...

Journal: :Advances in Space Research 2021

More than 27 years of high precision satellite altimetry enables analysis recent changes in global mean sea level (GMSL). Several previous studies present estimates the trend and acceleration GMSL; however, all are exclusively performed with data from TOPEX/Poseidon, Jason-1, Jason-2 Jason-3 missions (TPJ data). In this study we extend record both time space by including independent ERS-1, ERS-...

2011
T. Fecher

GOCE gravity fields define a new standard concerning spectral resolution of satellite-only models, and provide a very high precision in the longand medium wavelength part of the gravity field up to a spherical harmonic degree of about 250. Combining GOCE with GRACE data, which gives in addition very accurate information for the long wavelength part, results in the current performance status of ...

Journal: :JGISE: Journal of Geospatial Information Science and Engineering 2019

Journal: :Remote Sensing 2017
Xinggang Zhang Shuanggen Jin Xiaochun Lu

The Gravity Recovery and Climate Experiment (GRACE) mission is able to observe the global large-scale mass and water cycle for the first time with unprecedented spatial and temporal resolution. However, no other time-varying gravity fields validate GRACE. Furthermore, the C20 of GRACE is poor, and no GRACE data are available before 2002 and there will likely be a gap between the GRACE and GRACE...

2009
John A. Goff

[1] Sea surface height (SSH) measurements from the Geosat satellite altimetry mission are analyzed to statistically characterize their noise process, which is defined here as the small-scale (<50 km), timevarying component of the altimetry data. This analysis is one component of a larger effort to extract meaningful information about seafloor roughness from the small-scale fabric of the altimet...

ژورنال: فیزیک زمین و فضا 2018

The rise of satellite altimetry is a revolution in the ocean sciences. Due to its global coverage and its high resolution, altimetry classically outperforms in situ water level measurement. Ekman and geostrophic currents are large parts of the ocean’s current, playing a vital role in global climate variations. According to the classic oceanography, Ekman and geostrophic currents can be calculat...

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