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  • 1
    Call number: 6/M 17.90633
    In: International Association of Geodesy Symposia, 144
    Description / Table of Contents: Part 1 - Gravimetry and gravity networks -- Quality assessment of the new gravity control in Poland - first estimate -- Estimability in Strapdown Airborne Vector Gravimetr -- A First Traceable Gravimetric Calibration Line in the Swiss Alps -- Airborne gravimetry for geoid and GOCE -- Testing airborne gravity data in the large-scale area of Italy and adjacent seas -- The effect of helium emissions by a superconducting gravimeter on the rubidium frequency standards of absolute gravimeters -- Part 2 - Global geopotential models and vertical datum unification -- Wavelet multi-resolution analysis of recent GOCE/GRACE GGMs -- Evaluation of GOCE-based Global Geopotential Models Versus EGM2008 and GPS/Levelling Data in Northwest of Turkey -- Precise modelling of the static gravity field from the GOCE data using the method of fundamental solutions -- Towards a Vertical Reference Frame for South America in view of the GGOS specifications Andrea Galudht Santacruz Jaramillo, Sílvio Rogério Correia De Freitas, Laura Sánchez -- Ellipsoidal effects in high accuracy quasigeoid computations: verification of the apparatus Otakar Nesvadba, Petr Holota -- Evaluation of GOCE/GRACE GGMs over Attica and Thessaloniki, Greece, and Wo determination for height system unification -- The DTU13 MSS (Mean Sea Surface) and MDT (Mean Dynamic Topography) from 20 years of satellite altimetry -- Part 3 - Local geoid/gravity modeling -- A new gravimetric geoid model for the area of Sudan using the least squares collocation and a GOCE-based GGM -- Establishment of the Gravity Database AFRGDB V1.0 for the African Geoid -- Quasi-geoid model in the State of São Paulo -- Accurate Approximation of Vertical Gravity Gradient within the Earth’s External Gravity Field -- New geoid of Greenland, A case study of terrain and ice effects, GOCE and use of local sea level data -- Egyptian Geoid using Best Estimated Response of the Earth's Crust due to Topographic Loads -- Part 4 - Mass movements in the Earth system -- An investigation on the closure of the water budget methods over Volta Basin using multi-satellite data -- Application of Independent Component Analysis in GRACE- derived Water Storage Changes Interpretation, A case study of the Tibetan Plateau and its surrounding areas -- Mass variations in the Siberian permafrost region based on new GRACE results and auxiliary modeling -- Part 5 - Solid Earth Investigations -- Comparative study of the uniform and variable Moho density contrast in the Vening Meinesz-Moritz’s isostatic scheme for the gravimetric Moho recovery -- The New Method To Find The Anomalous Internal Structure Of Terrestrial Planets And Its Test On The Earth
    Description / Table of Contents: This volume contains the proceedings of 24 peer-reviewed papers presented at the 3rd International Gravity Field Service (IGFS) General Assembly, which was organized by the International Gravity Field Service (IGFS), Commission 2 of the International Association of Geodesy (IAG), and Shanghai Astronomical Observatory (SHAO), Chinese Academy of Sciences. The Assembly was successfully held in Shanghai, China from June 30th to July 6th, 2014 with over 130 participants from 25 countries. The focus of the Assembly is on methods for observing, estimating and interpreting the Earth gravity field as well as its applications, including 6 sessions: gravimetry and gravity networks, global geopotential models and vertical datum unification, local geoid/gravity modelling, satellite gravimetry, mass movements in the Earth system and solid Earth investigations
    Type of Medium: Monograph available for loan
    Pages: VIII, 224 Seiten , Illustrationen, Karten
    Edition: 1st ed. 2016
    ISBN: 9783319398198 (print) , 9783319398204
    Series Statement: International Association of Geodesy Symposia 144
    Classification:
    Gravimetry
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Call number: 6/M19.92211
    In: International Association of Geodesy Symposia, 148
    Description / Table of Contents: Part 1 Global gravity field modelling -- Rigorous evaluation of gravity field functionals from satellite-only gravitational models within topography -- Application of the Recursive Least-Squares adaptive filter on simulated satellite gravity gradiometry data -- Part 2 Local/regional geoid determination methods and models -- Accuracy of regional geoid modelling with GOCE -- The effect of noise on geoid height in Stokes-Helmert method -- Approximation of local quasi-geoid using point mass method based on Bjerhammar theory -- Optimal combination of satellite and terrestrial gravity data for regional geoid determination using Stokes-Helmert’s method, the Auvergne test case -- New modifications of Stokes’ Integral -- Gravimetric investigations at Vernagtferner -- Analysis of the GRAV-D airborne gravity data for geoid modelling -- The African 300”x300” DTM and its validation -- Evaluation of the African Gravity Database AFRGDB V1.0 -- Part 3 Absolute and relative gravity: observations and methods -- New absolute gravity measurements in New Zealand -- Strapdown airborne gravimetry using a combination of commercial software and stable-platform gravity estimates -- First six months of superconducting gravimetry in Argentina -- Tilt susceptibility of the Scintrex CG-5 Autograv gravity meter revisited -- Gravity calibration baseline between Jeddah and Taif in the Kingdom of Saudi Arabia -- Part 4 Height systems and vertical datum unification -- Investigation of geoid height variations and vertical displacements of the Earth surface in the context of the realization of a modern vertical reference system - A case study for Poland -- Analysis of GOCE omission error and its contribution to vertical datum offsets in Greece and its Islands -- Quality control of height benchmarks in Attica, Greece, combining GOCE/GRACE satellite data, global geopotential models and detailed terrain information -- GOCE variance and covariance contribution to height system unification -- The use of GNSS/levelling and gravity data for the Spanish height system unification -- Comparison of different approaches to gravity determination and their utilization for calculation of geopotential numbers in the Slovak national levelling network -- Assessment of the Greek Vertical Datum - A case study in central Greece -- Evaluation of NRTK-based heighting techniques from different continuously operating GNSS reference networks in Greece -- Part 5 Satellite altimetry and climate-relevant processes -- SLA determination in coastal areas using Least-Squares Collocation and Cryosat-2 data -- Spectral analysis and validation of Multiple Input / Multiple Output DOT estimation in the Eastern Mediterranean Sea -- Preliminary Results on the Estimation of Ground Water in Africa using GRACE and Hydrological Models
    Description / Table of Contents: These proceedings contain 27 papers, which are the peer-reviewed versions of presentations made at the International Association of Geodesy (IAG) symposium “Gravity, Geoid and Height Systems 2016” (GGHS2016). GGHS2016 was the first Joint international symposium organized by IAG Commission 2 “Gravity Field”, the International Gravity Field Service (IGFS) and the GGOS Focus Area “Unified Height System”. It took place in Thessaloniki, Greece, in September 19-23, 2016 at the premises of the Aristotle University of Thessaloniki. The symposium was organized by the Department of Geodesy and Surveying of the Aristotle University of Thessaloniki, which presently hosts the IGFS Central Bureau. The focus of the Symposium was on methods for observing, estimating and interpreting the Earth gravity field as well as its applications. GGHS2016 continued the long and successful history of IAG’s Commission 2 Symposia
    Type of Medium: Monograph available for loan
    Pages: IX, 230 Seiten
    ISBN: 9783319953182 , 9783319953175 (print) , 9783319953199 (print)
    Series Statement: International Association of Geodesy Symposia 148
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
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  • 3
    Publication Date: 2023-06-22
    Description: In 2015, the International Association of Geodesy defined the International Height Reference System (IHRS) as the conventional gravity field-related global height system. The IHRS is a geopotential reference system co-rotating with the Earth. Coordinates of points or objects close to or on the Earth’s surface are given by geopotential numbers C(P) referring to an equipotential surface defined by the conventional value W0 = 62,636,853.4 m2 s−2, and geocentric Cartesian coordinates X referring to the International Terrestrial Reference System (ITRS). Current efforts concentrate on an accurate, consistent, and well-defined realisation of the IHRS to provide an international standard for the precise determination of physical coordinates worldwide. Accordingly, this study focuses on the strategy for the realisation of the IHRS; i.e. the establishment of the International Height Reference Frame (IHRF). Four main aspects are considered: (1) methods for the determination of IHRF physical coordinates; (2) standards and conventions needed to ensure consistency between the definition and the realisation of the reference system; (3) criteria for the IHRF reference network design and station selection; and (4) operational infrastructure to guarantee a reliable and long-term sustainability of the IHRF. A highlight of this work is the evaluation of different approaches for the determination and accuracy assessment of IHRF coordinates based on the existing resources, namely (1) global gravity models of high resolution, (2) precise regional gravity field modelling, and (3) vertical datum unification of the local height systems into the IHRF. After a detailed discussion of the advantages, current limitations, and possibilities of improvement in the coordinate determination using these options, we define a strategy for the establishment of the IHRF including data requirements, a set of minimum standards/conventions for the determination of potential coordinates, a first IHRF reference network configuration, and a proposal to create a component of the International Gravity Field Service (IGFS) dedicated to the maintenance and servicing of the IHRS/IHRF.
    Description: https://www.ngs.noaa.gov/GRAV-D/data_ms05.shtml
    Keywords: ddc:526 ; International Height Reference System (IHRS) ; International Height Reference Frame (IHRF) ; World height system ; Global unified vertical reference system ; Geopotential height datum ; Permanent tide ; Tide systems ; The Colorado experiment
    Language: English
    Type: doc-type:article
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of geodesy 67 (1993), S. 119-126 
    ISSN: 1432-1394
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract In this paper a new method to compute in a fast and reliable way the collocation solution is presented. In order to speed up the numerical procedures, some restrictions on input data are needed. The basic assumption is that data are gridded and homogeneous; this implies that the autocovariance matrix entering in the collocation formula is of Toeplitz type. In particular, if observations are placed on a two dimensional planar grid, the autocovariance matrix is a symmetric block Toeplitz matrix and each block is itself a symmetric Toeplitz matrix (Toeplitz/Toeplitz structure). The analysis can be extended to a regular geographical grid, considered as a generalization of the planar one, taking into account the distortions on the Toeplitz/Toeplitz structure induced by the convergence of the meridians. The devised method is based on a combined application of the Preconditioned Conjugate Gradient Method and of the Fast Fourier Transform. This allows a proper exploitation of the Toeplitz/Toeplitz structure of the autocovariance matrix in computing the collocation solution. The numerical tests proved that the application of this algorithm leads to a relevant decrease in CPU time if compared with standard methods used to solve a collocation problem (Cholesky, Levinson).
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A combined seismic and gravimetric interpretation in the Northern Apennines area (Italy) is presented. To the knowledge of the authors, this is one of the few attempts to apply tomographic methodology to a seismic refraction profile. This procedure, together with the classical interpretation for defining lower reflectors, led to the formulation of quite an accurate model of the upper crust. A gravity analysis was performed concurrently taking into account the seismic results at different depths which correspond to different frequency domains in the gravity signal. While the medium- and high-frequency patterns have been solved by trial-and-error, the regional trend has been modelled applying the collocation procedure to the gravity data.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2010-04-16
    Description: A finite-element thermomechanical model is used to analyse present-day crustal deformation in the surroundings of the Calabrian Arc. The major structural complexities of the Tyrrhenian area are taken into account, along with the rheological properties of the rocks resulting from a thermal analysis. A comparison between the results obtained from a model composed of three wide rheologically uniform blocks and those obtained from the thermomechanical model allows us to better constrain the geophysical assumptions and shed light on the roles of the different active mechanisms acting in the Tyrrhenian. Our comparative analysis enlightens the crucial role played by lateral rheological heterogeneities when deformation is analysed at short wavelengths of a few hundred kilometres of the Tyrrhenian, driving the observed diffuse SW-NE extension within the regional context of active Africa-Eurasia convergence. Furthermore, a {chi}2 analysis based on comparisons with GPS data confirms the hypothesis that a significant part of the Africa-Eurasia convergence is absorbed through the Calabrian subduction.
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  • 7
    Publication Date: 2014-01-03
    Print ISSN: 1866-9298
    Electronic ISSN: 1866-928X
    Topics: Architecture, Civil Engineering, Surveying
    Published by Springer
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  • 8
    Publication Date: 2020-06-26
    Description: In 2014, the Jeddah Municipality made a call for an estimate of a centimetric precision geoid model to be used for engineering and surveying applications, because the regional geoid model available at that time did not reach a sufficient precision. A project was set up to this end and dedicated sets of gravity and Global Positioning System (GPS)/levelling data were acquired in the framework of this project. In this paper, a thorough analysis of these newly acquired data and of the last available Global Gravity Field Models (GGMs) has been done in order to obtain a geoid undulation estimate with the prescribed precision. In the framework of the Remove–Compute–Restore (RCR) approach, the collocation method was used to obtain the height anomaly estimation that was then converted to geoid undulation. The remove and restore steps of the RCR approach were based on GGMs, derived from the Gravity Field and Steady-State Ocean Circulation Explorer (GOCE) and Gravity Recovery and Climate Experiment (GRACE) dedicated gravity satellite missions, which were used to improve the long wavelength components of the Earth’s gravity field. Furthermore, two different quasi-geoid collocation estimates were computed, based on gravity data only and on gravity plus GPS/levelling data (the so-called hybrid estimate). The best solutions were obtained with the hybrid geoid estimate. This was tested by comparison with an independent set of GPS/levelling geoid undulations that were not included in the computed solutions. By these tests, the precision of the hybrid geoid is estimated to be 3.7 cm. This precision proved to be better, by a factor of two, than the corresponding one estimated from the pure gravimetric geoid. This project has been also useful to verify the importance and reliability of GGMs developed from the last satellite gravity missions (GOCE and GRACE) that have significantly improved our knowledge of the long wavelength components of the Earth’s gravity field, especially in areas with poor coverage of terrestrial gravity data. In fact, the geoid models based on satellite-only GGMs proved to have a better performance, despite the lower spatial resolution with respect to high-resolution models (i.e., Earth Gravitational Model 2008 (EGM2008)).
    Electronic ISSN: 2072-4292
    Topics: Architecture, Civil Engineering, Surveying , Geography
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  • 9
    Publication Date: 2020-09-09
    Description: We present a novel inverse method for discriminating regional deformation and long-term fault creep by inversion of GNSS velocities observed at the spatial scale of intraplate faults by exploiting the different spatial signatures of these two mechanisms. In doing so our method provides a refined estimate of the upper bound of the strain accumulation process. As case study, we apply this method to a six year GNSS campaign (2003–2008) set up in the southern portion of the Pollino Range over the Castrovillari and Pollino faults. We show that regional deformation alone cannot explain the observed deformation pattern and implies high geodetic strain rate, with a WSW-ENE extension of 86±41×10−9/yr. Allowing for the possibility of fault creep, the modelling of GNSS velocities is consistent with their uncertainties and they are mainly explained by a shallow creep over the Pollino fault, with a normal/strike-slip mechanism up to 5 mm/yr. The regional strain rate decrease by about 70 percent and is characterized by WNW-ESE extension of 24±28×10−9/yr. The large uncertainties affecting our estimate of regional strain rate do not allow infering whether the tectonic regime of the area is extensional or strike-slip, although the latter is slightly more likely.
    Electronic ISSN: 2072-4292
    Topics: Architecture, Civil Engineering, Surveying , Geography
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  • 10
    Publication Date: 2007-05-01
    Print ISSN: 0196-2892
    Electronic ISSN: 1558-0644
    Topics: Architecture, Civil Engineering, Surveying , Geography
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