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  • 1
    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
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  • 2
    Call number: S 90.0092(85)
    In: Mitteilungen der geodätischen Institute der Technischen Universität Graz
    Type of Medium: Series available for loan
    Pages: IV, 133 S.
    Series Statement: Mitteilungen der geodätischen Institute der Technischen Universität Graz 85
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    Location: Lower compact magazine
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  • 3
  • 4
    Call number: M 21. 94487
    Description / Table of Contents: Einführung -- Die Vermessung der Erde im Wandel der Zeit -- Die Geodäsie im 21. Jahrhundert – Globale Referenzsysteme und moderne geodätische Raumbeobachtungsverfahren -- Unser Planet im Fokus – Phänomene des globalen Wandels -- Gesellschaftliche Relevanz der hochgenauen Vermessung unseres Planeten aus dem Weltraum.
    Description / Table of Contents: Woher weiß Ihr Handy, wo Sie gerade unterwegs sind? Wie verändert sich unser Planet aufgrund von geodynamischen Prozessen und dem fortschreitenden Klimawandel? Wie können diese Veränderungen präzise aus dem Weltraum vermessen werden, um verlässliche Aussagen etwa über das Abschmelzen der Eisschilde oder die Bedrohung von Küstenregionen durch den steigenden Meeresspiegel zu erhalten? Das vorliegende Sachbuch gibt Antworten auf diese gesellschaftlich relevanten Fragen. Es richtet sich an interessierte Laien, die mehr über unseren faszinierenden Planeten erfahren wollen, aber auch an Fachexperten naturwissenschaftlicher Disziplinen. Sie werden mitgenommen auf eine spannende Zeitreise von den ersten Vermessungen in der Antike bis in das Zeitalter der Satelliten, die uns die weltweite Bestimmung von extrem genauen Positionen und eine globale Sicht auf unseren Heimatplaneten ermöglichen. Anhand anschaulicher Beispiele wird vermittelt, wie tief die globale Positionierung und Navigation mit Satelliten unseren Alltag durchdrungen haben, und welche fundamentalen Beiträge die Geodäsie als die Wissenschaft von der Vermessung der Erde zum Verständnis des Erdsystems und zur Bestimmung der Auswirkungen des Klimawandels liefert. Mit Interviewbeiträgen von Günter Hein, Harald Lesch und Stefan Rahmstorf Die Autoren Detlef Angermann ist promovierter Geodät und leitet den Bereich Referenzsysteme am Deutschen Geodätischen Forschungsinstitut der TU München. Roland Pail ist Professor für Astronomische und Physikalische Geodäsie an der TU München. Florian Seitz ist Professor für Geodätische Geodynamik und leitet das Deutsche Geodätische Forschungsinstitut der TU München. Urs Hugentobler ist Professor für Satellitengeodäsie und leitet die Forschungseinrichtung Satellitengeodäsie der TU München.
    Pages: XVI, 275 Seiten , Illustrationen
    ISBN: 9783662623374
    URL: Cover
    Language: German
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 5
    Call number: S 91.0550(31)
    In: Österreichische Beiträge zu Meteorologie und Geophysik
    Type of Medium: Series available for loan
    Pages: X, 191 S.
    Series Statement: Österreichische Beiträge zu Meteorologie und Geophysik 31
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  • 6
    Call number: 6/M 20.93577
    In: International Association of Geodesy Symposia, 150
    Type of Medium: Monograph available for loan
    Pages: X, 114 Seiten , Illustrationen
    ISBN: 9783030394370
    Series Statement: International Association of Geodesy Symposia 150
    Language: English
    Location: Reading room
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  • 7
    Publication Date: 2017-09-15
    Description: Abstract
    Description: The experimental gravity field model XGM2016 is an outcome of TUM's assessment of a 15'x15' data grid excerpt provided from NGA's updated and revised gravity data base. The assessment shall support NGA's efforts on the way on the way to the Earth Gravity Model EGM2020.
    Description: Other
    Description: XGM2016 is a combination model based on the satellite-only gravity field model GOCO05s and a global 15'x15' data grid provided from NGA's data base.
    Keywords: ICGEM ; global gravitational model ; GOCO ; Geodesy ; GOCE
    Language: English
    Type: Dataset , Dataset
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  • 8
    Publication Date: 2017-05-23
    Description: Abstract
    Description: GOCO05c is a static global combined gravity field model up to d/o 720. It has been elaborated by the GOCO Group (TU Munich, Bonn University, TU Graz, Austrian Academy of Sciences, University Bern). GOCO05c is a combination model based on the satellite-only gravity field model GOCO05s and several gravity anomaly datasets, constituting a global 15'x15' data grid. The combination is carried out in term of full normal equation systems.Contributing Institutions are: (1) TU Muenchen, DE, Institute of Astronomical and Physical Geodesy; (2) University of Bonn, DE, Institute of Geodesy and Geoinformation; (3) TU Graz, AU, Institute of Theoretical and Satellite Geodesy; (4) Austrian Academy of Sciences, Space Research Institute, and (5) University of Bern, CH, Astronomical Institute
    Description: Other
    Description: Global 15’x15’ data grid: Region (Source): Number of data cellsArctic (ArcGP Group): 44522Australia (Curtin University):11170Canada (NRCan):19259Europe (IfE Hanover):15625Oceans (DTU Space): 691818South America (NGA): 24818USA (NGA): 12895For the remaining land areas (Central America, Asia, Africa, Antarctica) fill-in datasets were used: Data (Source): Number of data cells NIMA96 (DMA/GSFC): 110594GOCO05s (GOCO Group): 106099 (band-limited gravity anomalies)RWI_TOIS2012 (KIT): 117737 (topographic anomalies)GOCO05c should not be used for geophysical applications in fill-in regions, because its high frequency part in fill-in regions resulted from simple synthetic numeric forward modelling of topographic information.
    Keywords: ICGEM ; global gravitational model ; GOCO ; Geodesy ; GOCE
    Language: English
    Type: Dataset , Dataset
    Format: 14167050 Bytes
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  • 9
    Publication Date: 2019-08-22
    Description: Abstract
    Description: TIM_R6e is an extended version of the satellity-only global gravity field model TIM_R6 (Brockmann et al., 2019) which includes additional terrestrial gravity field observations over GOCE's polar gap areas. The included terrestrial information consists of the PolarGap campaign data (Forsberg et al., 2017) augumented by the AntGG gravity data compilation (Scheinert et al., 2016) over the southern polar gap (〉83°S) and the ArcGP data (Forsberg et al. 2007) over the northern polar gap (〉83°N). The combination is performed on normal equation level, encompassing the terrestrial data as spectrally limited geographic 0.5°x0.5° grids over the polar gaps.
    Description: TechnicalInfo
    Description: Processing procedures: (extending TIM_R6)Gravity from orbits (SST): (identical to TIM_R6)- short-arc integral method applied to kinematic orbits, up to degree/order 150- orbit variance information included as part of the stochastic model, it is refined by empirical covariance functionsGravity from gradients (SGG): (identical to TIM_R6)- parameterization up to degree/order 300- observations used: Vxx, Vyy, Vzz and Vxz in the Gradiometer Reference Frame (GRF)- realistic stochastic modelling by applying digital decorrelation filters to the observation equations; estimated separately for individual data segments applying a robust procedureGravity from terrestrial observations (TER):- collocation of the original terrestrial data sources onto 30'x30' geographic gravity disturbance grids (in the polar gap areas above 83° southern/northern latitude, thus forming a pair of polar caps)- spectral limitation of the data to D/O 300 within the collocation process- the chosen grid is fully compatible with the grid of the zero observation constraints of the original TIM_R6 model. In its function it replaces the original constraints- from the collocated polar caps, a partial normal equation system, up to D/O 300 is derivedCombined solution:- addition of normal equations (SST D/O 150, SGG D/O 300, TER D/O 300)- Constraints: * Kaula-regularization applied to coefficients of degrees/orders 201 - 300 (constrained towards zero, fully compatible with TIM_R6)- weighting of SST and SGG is identical to TIM_R6. All TER observations are weighted with 5 mGal.Specific features of resulting gravity field:- Gravity field solution is (mostly) independent of any other gravity field information (outside the polar gap region)- Constraint towards zero starting from degree/order 201 to improve signal-to-noise ratio- Related variance-covariance information represents very well the true errors of the coefficients (outside the polar gap region)- Solution can be used for independent comparison and combination on normal equation level with other satellite-only models (e.g. GRACE), terrestrial gravity data, and altimetry (outside the polar gap region)- Since in the low degrees the solution is based solely on GOCE orbits, it is not competitive with a GRACE model in this spectral region (outside the polar gap region)- In comparison to TIM_R6, TIM_R6e should deliver more accurate results, especially towards the polar gaps. However, as it uses additional data sources it cannot be seen as totally independent anymore: even outside the polar gap regions correlations (introduced by the holistic nature of spherical harmonics) may be found.
    Keywords: global gravitational model ; ICGEM ; GOCE ; PolarGap ; geodesy ; EARTH SCIENCE 〉 SOLID EARTH 〉 GEODETICS 〉 GEOID CHARACTERISTICS ; EARTH SCIENCE 〉 SOLID EARTH 〉 GRAVITY/GRAVITATIONAL FIELD 〉 GRAVITY
    Language: English
    Type: Dataset , Dataset
    Format: 3 Files
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  • 10
    Publication Date: 2020-08-03
    Description: Abstract
    Description: XGM2019e is a combined global gravity field model represented through spheroidal harmonics up to d/o 5399, corresponding to a spatial resolution of 2’ (~4 km). As data sources it includes the satellite model GOCO06s in the longer wavelength area combined with terrestrial measurements for the shorter wavelengths. The terrestrial data itself consists over land and ocean of gravity anomalies provided by courtesy of NGA (identical to XGM2016, having a resolution of 15’) augmented with topographically derived gravity over land (EARTH2014). Over the oceans, gravity anomalies derived from satellite altimetry are used (DTU13, in consistency with the NGA dataset).The combination of the satellite data with the terrestrial observations is performed by using full normal equations up to d/o 719 (15’). Beyond d/o 719, a block-diagonal least-squares solution is calculated for the high-resolution terrestrial data (from topography and altimetry). All calculations are performed in the spheroidal harmonic domain.In the spectral band up to d/o 719 the new model shows over land a slightly improved behavior over preceding models such as XGM2016, EIGEN6c4 or EGM2008 when comparing it to independent GPS leveling data. Over land and in the spectral range above d/o 719 the accuracy of XGM2019e suffers from the sole use of topographic forward modelling; Hence, errors are increased in well-surveyed areas compared to models containing real gravity data, e.g. EIGEN6c4 or EGM2008. However, the performance of XGM2019e can be considered as globally more homogeneous and independent from existing high resolution global models. Over the oceans the model exhibits an improved performance throughout the complete spectrum (equal or better than preceding models).
    Keywords: geodesy ; global gravity field model ; ICGEM ; GOCO ; GOCE ; EARTH SCIENCE 〉 SOLID EARTH 〉 GEODETICS 〉 GEOID CHARACTERISTICS ; EARTH SCIENCE 〉 SOLID EARTH 〉 GRAVITY/GRAVITATIONAL FIELD 〉 GRAVITY
    Language: English
    Type: Dataset , Dataset
    Format: 6 Files
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