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  • 1
    Online Resource
    Online Resource
    München : Technische Universität München, Deutsches Geodätisches Forschungsinstitut (DGFI-TUM)
    Keywords: Forschungsbericht ; Ionosphäre ; Modellierung ; Kalman-Filter
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (34 Seiten, 2,30 MB) , Illustrationen, Diagramme
    Language: German
    Note: Förderkennzeichen BMWi 50LZ1403 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Zusammenfassungen in deutscher und englischer Sprache
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  • 2
    Online Resource
    Online Resource
    Berlin, Heidelberg : Springer Berlin Heidelberg | Berlin, Heidelberg : Imprint: Springer
    Keywords: Geography.
    Description / Table of Contents: Introduction -- Surveying the Earth through the ages -- Geodesy in the 21st century - Global reference systems and modern geodetic space observation techniques -- Our planet in focus - Phenomena of global change -- Social relevance of high-precision measurement of our planet from space.
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource(XII, 246 p. 74 illus., 68 illus. in color.)
    Edition: 1st ed. 2022.
    ISBN: 9783662641064
    Language: English
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  • 3
    Online Resource
    Online Resource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Keywords: Climatic changes. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (254 pages)
    Edition: 1st ed.
    ISBN: 9783662641064
    DDC: 526.1
    Language: English
    Note: Intro -- Preface -- Contents -- About the Authors -- Prologue -- 1: Introduction -- 1.1 The Earth: A Dynamic Planet -- 1.2 Earth System, Climate Change and Society -- 1.3 Geodynamic Processes: Very Different Speed -- 1.4 Global Measurement of the Earth -- Geometry and Kinematics -- Orientation and Rotation -- Gravity Field -- 2: The Measurement of the Earth Through Time -- 2.1 Introduction -- 2.2 The Origins of Surveying -- 2.3 Ancient Greece: From the Disk to the Spherical Earth -- 2.4 Surveying Skills in the Roman Empire -- 2.5 More Than a Change of Perspective: The Difficult Transition from the Geocentric to the Heliocentric World System -- 2.6 The Physics of the Universe: From Newton to Einstein -- 2.7 Is the Earth Round Like a Sphere?: The Bitter Dispute About the Figure of the Earth -- 2.8 Triangle by Triangle: The First Nationwide Survey of Germany -- 2.9 Geodesy on the Way to an International Science -- 2.10 First Satellite Launch in 1957: The Beginning of a New Era -- 3: Geodesy in the Twenty-First Century: Global Reference Systems and Modern Geodetic Observation Techniques -- 3.1 Introduction -- 3.2 We Need a Global Reference: The Central Importance of Highly Accurate Reference Systems -- 3.3 Positioning in Seconds and with Millimeter Accuracy: The Potential of Global Satellite Navigation Systems -- 3.4 Messages from the Edge of the Universe: Measuring the Earth Using Signals from Distant Galaxies -- 3.5 Measuring Objects in the Sky: Laser Distance Measurements to Satellites and the Moon -- Space Segment -- Ground Segment -- SLR Measurements -- International Organization of the SLR Activities -- 3.6 Measuring Sea Level and Ice Cover from Space -- 3.7 Newton's Law of Gravity: What Information Do We Know About the Earth's Gravitational Field and Mass Distribution? -- From Apples to Gravity. , The Earth's Gravitational Field -- Gravity Field and Height -- Gravity Field and Ocean -- Time Variations of the Earth Gravity Field -- 3.8 Observing the Gravity Field by Means of Satellites -- Satellite Observation Concepts -- Satellite Missions -- 3.9 Surveying the World from the Bavarian Forest: The Geodetic Observatory Wettzell -- 4: Our Planet in the Focus: Phenomena of Global Change -- 4.1 Introduction -- 4.2 "Eppure si muove": Dynamic Processes of the Solid Earth -- Processes Inside the Earth -- Plate Tectonics -- Earthquakes -- 4.3 Tsunamis: The Unimaginable Huge Power of Water -- Causes and Formation of Tsunamis -- The Physics of a Tsunami -- Tsunami Early Warning Systems -- 4.4 How Is Sea Level Changing? -- Sea Level Rise: True or false? -- Contributions to Sea Level Rise -- Fingerprint of Sea Level Rise -- Absolute Versus Relative Sea Level -- Effects and Prospects -- 4.5 How Large Is the Ice Loss in Greenland and Antarctica? -- Eternal Ice? -- Processes of Change of Ice Sheets -- Measuring Ice Mass Balances -- Ice Mass Changes in Greenland and Antarctica -- 4.6 Hydrogeodesy: How Can We Track Water? -- Is Enough Water for Everyone? -- Global Water Cycle and Water Mass Balance -- Hydrological Models and/or Geodetic Observation -- Inland Altimetry and Remote Sensing for Monitoring Lakes and River Systems -- Water: Blessing or Danger? Droughts, Floods and Water Resource Management -- 4.7 The Rotation of the Earth: Our Tumbling in Space and Our Annual Journey Around the Sun -- 5: Societal Relevance of Geodetic Earth Observation -- 5.1 Introduction -- 5.2 Mobile World: Navigation Systems in a Modern Society -- 5.3 Interconnected World: The Holistic View of the Earth System -- 5.4 Endangered World: Alarming Signals of Climate Change -- Epilogue -- Acknowledgements -- Recommended Reading -- Index.
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  • 4
    Keywords: Geodesy -- Observations. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (179 pages)
    Edition: 1st ed.
    ISBN: 9783319108285
    Series Statement: International Association of Geodesy Symposia Series ; v.140
    Language: English
    Note: Intro -- Preface -- Contents -- Part I Uncertainty Modeling of Geodetic Data -- Modeling Data Quality Using Artificial Neural Networks -- 1 Introduction -- 2 Data Quality Propagation with Artificial Neural Networks -- 3 Propagation of Data Quality for Polar Point Determination -- 4 Propagation of Data Quality for Mobile Phone Positioning -- Conclusion -- References -- Magic Square of Real Spectral and Time Series Analysis with an Application to Moving Average Processes -- 1 Introduction -- 2 Basic Elements of Stochastic Processes -- 3 Magic Square for Covariance-Stationary, Discrete-Time Processes -- 3.1 Time Domain (Left-Hand Side) -- Example: MA(q) Process -- 3.2 Frequency Domain (Right-Hand Side) -- Example: MA(q) Process -- 3.3 Transitions Between the Time and Frequency Domain -- Example: MA(q) Process -- Conclusion and Outlook -- References -- Describing the Quality of Inequality Constrained Estimates -- 1 Introduction and Motivation -- 2 Background -- 3 MC-QP Method -- 3.1 Propagation of the Probability Density -- 3.2 Confidence Regions (HPD Regions) -- 3.3 Influence of the Constraints -- 4 Case Study -- 5 Summary and Outlook -- References -- GNSS Integer Ambiguity Validation Procedures: Sensitivity Analysis -- 1 Introduction -- 2 Ambiguity Estimation and Validation Procedure -- 2.1 Ambiguity Estimation -- 2.2 Ambiguity Validation with W-Ratio Test -- 3 Sensitivity Analysis for the Validation Tests -- 3.1 Description of Test Data Sets and Data Processing -- 3.2 Impact of Undetected Outliers -- 3.3 Impact of Stochastic Modeling -- 3.4 Satellite Configurations -- Concluding Remarks -- References -- Optimal Design of Deformation Monitoring Networks Using the Global Optimization Methods -- 1 Introduction -- 2 The Optimal Design Problem -- 3 The Shuffled Frog Leaping Algorithm -- 4 An Example -- Conclusions -- References. , Part II Theoretical Studies on Combination Strategies and Parameter Estimation -- Towards the Combination of Data Sets from Various Observation Techniques -- 1 Introduction -- 2 Gauss-Markov Model -- 3 Combination Models -- 4 Numerical Example -- 5 Multi-scale Combination -- Conclusion -- References -- On the Weighted Total Least Squares Solutions -- 1 Introduction -- 2 Mathematical Models of the TLS Problem -- 3 The Weighted TLS Solutions -- 3.1 Solutions Using Lagrange Multipliers -- 3.2 Solutions Using the GHM Method -- 3.3 Solutions Using the Gradient -- 4 Test Results -- Conclusions and Further Work -- Appendix -- References -- Integration of Observations and Models in a Consistent Least Squares Adjustment Model -- 1 Introduction -- 2 Integration in a Least Squares Adjustment Model -- 2.1 Functional Model -- 2.2 Stochastic Model -- 2.3 Linear Least Squares Adjustment -- 3 Example -- Conclusions and Outlook -- References -- Comparison of Different Combination Strategies Applied for the Computation of Terrestrial Reference Frames and Geodetic Parameter Series -- 1 Introduction -- 2 Least Squares Adjustment by Gauß-Markov Model -- 3 Combination Strategies -- 3.1 Combination on Observation Level -- 3.2 Combination on Normal Equation Level -- 3.3 Combination on Parameter Level -- 4 Comparison of the Different Combination Strategies -- 5 Combination in the Geodetic Practice: The Realization of ITRS -- Summary and Conclusions -- References -- W-Ratio Test as an Integer Aperture Estimator: Pull-in Regions and Ambiguity Validation Performance -- 1 Introduction -- 2 Parameter Estimation -- 3 W-Ratio Statistical Test -- 4 W-Ratio as an Integer Aperture Estimator -- 5 Numerical Analysis -- Concluding Remarks -- References -- Performing 3D Similarity Transformation Using the Weighted Total Least-Squares Method -- 1 Introduction. , 2 Nonlinear 3D Similarity Transformation -- 3 The Nonlinear 3D Similarity Transformation Solved by the Solution Within the Nonlinear GH Model -- 4 Case Study -- Concluding Remarks -- References -- Comparison of SpatialAnalyzer and Different Adjustment Programs -- 1 Introduction -- 2 Net Adjustment -- 2.1 SpatialAnalyzer -- 2.2 Network -- 2.3 Results -- 3 Form Fitting -- Conclusion -- References -- Part III Recursive State-Space Filtering -- State-Space Filtering with Respect to Data Imprecision and Fuzziness -- 1 Introduction -- 2 Modeling of Imprecision and Fuzziness -- 2.1 Sources of Uncertainty -- 2.2 Modeling of Uncertainty -- 3 Introduction to State-Space Filtering -- 3.1 System and Measurement Equation -- 3.2 Extended Kalman Filter -- 4 Imprecise Filter Extension -- 4.1 General Case -- 4.2 KF with Imprecise and Fuzzy Data -- 5 Example for Imprecise Kalman Filtering -- Conclusions -- References -- Unscented Kalman Filter Algorithm with Colored Noise and Its Application in Spacecraft Attitude Estimation -- 1 Introduction -- 2 Mathematical Model of Satellite Attitude -- 2.1 Quaternion in Satellite Attitude -- 2.2 Nonlinear Model of the Satellite Attitude -- 3 UKF Algorithm -- 4 Series Representation of Colored Noise and Its Variance Calculation -- 5 Test Computation and Analysis -- Concluding Remarks -- References -- Principles and Comparisons of Various Adaptively Robust Filters with Applications in Geodetic Positioning -- 1 Introduction -- 2 Principle of Adaptive Filtering -- 2.1 Principle of Fading Kalman Filter -- 2.2 Principle of Sage Windowing Filter -- 2.3 Principle of Robust Filter -- 2.4 Adaptively Robust Filter -- 3 Design of the Adaptive Factors -- 3.1 Fading Factors -- 3.2 Robust Weight Element -- 3.3 Adaptive Factors -- 4 Computations and Comparisons -- Concluding Remarks -- References. , Alternative Nonlinear Filtering Techniques in Geodesy for Dual State and Adaptive Parameter Estimation -- 1 Introduction -- 2 Nonlinear State Estimation -- 2.1 The Probabilistic Inference -- 2.2 The Bayes Filter -- 2.3 The Extended Kalman Particle Filter -- 2.4 Combined Parameter and State Estimation in EKPF Algorithm -- 3 Numerical Applications -- 3.1 Tracking of a Nonlinear Trajectory -- 3.2 Tracking of a Nonlinear Trajectory -- Conclusion -- References -- Part IV Sensor Networks and Multi Sensor Systems in Engineering Geodesy -- Parametric Modeling of Static and Dynamic Processes in Engineering Geodesy -- 1 Introduction -- 2 Parametric Modeling of Deformation Processes -- 3 Case Study: The Mass Movement `Steinlehnen' -- 3.1 Monitoring System -- 3.2 Parametric Slope Model -- 4 Parametric Identification of a Simplified Scarp -- 4.1 Static Example -- 4.2 Dynamic Example -- Conclusions -- References -- Land Subsidence in Mahyar Plain, Central Iran, Investigated Using EnvisatSAR Data -- 1 Introduction -- 2 Study Area -- 3 Methodology -- 4 Experimental Results and Analysis -- 4.1 InSAR Result -- 4.2 Earth Fissures -- 4.3 Piezometric Records -- Conclusions -- References -- Recent Impacts of Sensor Network Technology on Engineering Geodesy -- 1 Introduction -- 2 Geo Sensor Network Technology -- 2.1 General Statements -- 2.2 Sensing -- 2.3 Communication -- 2.4 Network Operating -- 3 Selected Aspects -- 3.1 Calibration of Motes: An Example -- 3.2 Carrier Phase Based Positioning Using Simple Navigation Receivers -- Conclusion and Outlook -- References -- Design of Artificial Neural Networks for Change-Point Detection -- 1 Introduction -- 2 Artificial Neural Networks -- 3 Change-Point Detection by ANN -- 4 Results and Practical Considerations -- 5 Summary and Outlook -- References. , Spatial and Temporal Kinematics of the Inylchek Glacier in Kyrgyzstan Derived from Landsat and ASTER Imagery -- 1 Introduction -- 2 Data and Methodology -- 2.1 ASTER Imagery -- 2.2 Landsat Imagery -- 3 Results -- Conclusion -- References -- Response Automation in Geodetic Sensor Networks by Means of BayesianNetworks -- 1 Introduction -- 2 State Description -- 3 Bayesian Networks for the Assessment of Events -- 4 Soft Evidence by Kalman Filter -- 5 Simulation Results -- Conclusion -- References -- Efficiency Optimization of Surveying Processes -- 1 Introduction -- 2 Process Modeling and Simulation -- 2.1 Elements of a Petri Net -- 2.2 Timed Petri Nets -- 2.3 Run of a Petri Net -- 3 Optimization -- 4 Time Model -- 5 Numerical Study and Results -- 6 Summary and Outlook -- References -- Modeling and Propagation of Quality Parameters in Engineering Geodesy Processes in Civil Engineering -- 1 Introduction -- 2 Quality Model -- 2.1 Fundamentals -- 2.2 Exemplary Parameters -- 3 Quality Propagation Methods -- 3.1 General -- 3.2 Standard Deviation -- 3.3 Tolerance Correctness -- 4 Simulation Results -- 4.1 Example: Basement Walls -- 4.2 Different Simulation Scenarios -- Conclusions -- References -- Part V Multi-Mission Approaches with View to Physical Processes in the Earth System -- Completion of Band-Limited Data Sets on the Sphere -- 1 Introduction -- 2 Stochastic Processes on the Sphere -- 3 Model Building and Separability -- 4 Application and Simulations -- Summary and Conclusions -- Appendix -- Expectation and Variance of a Stochastic Process in Amplitude/Phase Notation on the Sphere -- References -- List of Reviewers -- Author Index.
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  • 5
    Keywords: Geography ; Physical geography ; Earth Sciences ; Remote sensing ; Geophysics. ; Geotechnical engineering. ; Konferenzschrift ; Satellitengeodäsie ; Multisensor ; Messunsicherheit
    Description / Table of Contents: These proceedings contain 25 papers, which are the peer-reviewed versions of presentations made at the 1st International Workshop on the Quality of Geodetic Observation and Monitoring (QuGOMS’11), held 13 April to 15 April 2011 in Garching, Germany. The papers were drawn from five sessions which reflected the following topic areas: (1) Uncertainty Modeling of Geodetic Data, (2) Theoretical Studies on Combination Strategies and Parameter Estimation, (3) Recursive State-Space Filtering, (4) Sensor Networks and Multi Sensor Systems in Engineering Geodesy, (5) Multi-Mission Approaches With View to Physical Processes in the Earth System.
    Type of Medium: Online Resource
    Pages: Online-Ressource (VIII, 183 p. 109 illus, online resource)
    ISBN: 9783319108285
    Series Statement: International Association of Geodesy Symposia 140
    RVK:
    Language: English
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  • 6
    Online Resource
    Online Resource
    München : Inst. für Astronomische und Physikalische Geodäsie
    Keywords: Forschungsbericht ; Hochschulschrift
    Type of Medium: Online Resource
    Pages: Online Ressource, 102 p. = 2,79 Mb., text and images , ill., graphs
    Edition: [Elektronische Ressource]
    Series Statement: IAPG-FESG 10
    Language: German
    Note: nIndex p. 99 - 101. - Differences between the printed and electronic version of the document are possible , Also available as printed version , Zugl.: München, Techn. Univ., Diplomarbeit, 2000 , Systemvoraussetzungen: Acrobat reader.
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  • 7
    Publication Date: 2023-07-04
    Description: In the analysis of very long baseline interferometry (VLBI) observations, many geophysical models are used for correcting the theoretical signal delay. In addition to the conventional models described by Petit and Luzum (eds) (IERS Conventions, 2010), we are applying different parts of non-tidal site loading, namely the atmospheric, oceanic, and hydrological ones. To investigate their individual contributions, these parts are considered both separately and combined to a total loading. The application of the corresponding site displacements is performed at two distinct levels of the geodetic parameter estimation process (observation and normal equation level), which turn out to give very similar results in many cases. To validate our findings internally, the site displacements are provided by two different data centres: the Earth-System-Modelling group at the Deutsches GeoForschungsZentrum in Potsdam (ESMGFZ, see Dill and Dobslaw, J Geophys Res Solid Earth, 2013. https://doi.org/10.1002/jgrb.50353)] and the International Mass Loading Service [IMLS, see Petrov (The international mass loading service, 2015)]. We show that considering non-tidal loading is actually useful for mitigating systematic effects in the VLBI results, like annual signals in the station height time series. If the sum of all non-tidal loading parts is considered, the WRMS of the station heights and baseline lengths is reduced in 80–90% of all cases, and the relative improvement is about − 3.5% on average. The main differences between our chosen providers originate from hydrological loading.
    Description: Technische Universität München (1025)
    Description: ftp://cddis.nasa.gov/vlbi/ivsdata/vgosdb/
    Description: http://rz-vm115.gfz-potsdam.de:8080/repository
    Keywords: ddc:526 ; VLBI ; Non-tidal loading ; Normal equation level ; ESMGFZ ; IMLS
    Language: English
    Type: doc-type:article
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  • 8
    Publication Date: 2023-11-17
    Description: Increasing ice loss of the Antarctic Ice Sheet (AIS) due to global climate change affects the orientation of the Earth’s spin axis with respect to an Earth-fixed reference system (polar motion). Here the contribution of the decreasing AIS to the excitation of polar motion is quantified from precise time variable gravity field observations of the Gravity Recovery and Climate Experiment (GRACE) and from measurements of the changing ice sheet elevation from altimeter satellites. While the GRACE gravity field models need to be reduced by noise and leakage effects from neighboring subsystems, the ice volume changes observed by satellite altimetry have to be converted into ice mass changes. In this study we investigate how much individual gravimetry and altimetry solutions differ from each other. We show that due to combination of individual solutions systematic and random errors of the data processing can be reduced and the robustness of the geodetic derived AIS polar motion excitations can be increased. We investigate the interannual variability of the Antarctic polar motion excitation functions by means of piecewise linear trends. We find that the long-term behavior of the three ice sheet subregions: EAIS (East Antarctic Ice Sheet), WAIS (West Antarctic Ice Sheet) and APIS (Antarctic Peninsula Ice Sheet) is quite different. While APIS polar motion excitations show no significant interannual variations during the study period 2003-2015, the trend of the WAIS and EAIS polar motion excitations increased in 2006 and again in 2009 while it started slightly to decline in 2013. AIS mass changes explain about 45% of the observed magnitude of the polar motion vector (excluding glacial isosatic adjustment). They cause the pole position vector to drift along 59〈sup〉◦〈/sup〉 East longitude with an amplitude of 2.7 mas/yr. Thus the contribution of the AIS has to be considered to close the budget of the geophysical excitation functions of polar motion.
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: European Space Agency (FR)
    Description: Technische Universität München (1025)
    Keywords: ddc:550 ; Antarctic polar motion excitations ; Combination of GRACE and satellite altimetry data
    Language: English
    Type: doc-type:article
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  • 9
    Publication Date: 2023-11-24
    Description: The water surface slope (WSS) of rivers is essential for estimating flow velocity and discharge. It is also helpful as a correction applied to range measurements of satellite altimetry missions to derive water level time series at a virtual station. Using radar altimetry, WSS can only be roughly estimated and is limited to wide rivers because of its coarse spatiotemporal resolution. In contrast, the lidar sensor onboard Ice, Cloud, and Land Elevation Satellite 2 (ICESat‐2) can also observe small rivers. Using ICESat‐2's unique measurement geometry with six parallel laser beams, we derive instantaneous WSS along and across the satellite's ground track, time‐variable WSS (with an average of 5 days of records in the studied epoch between October 2018 and October 2021), and average WSS on reach‐scale. Although the method can be applied globally, this study is limited to 815 reaches in Europe and North America where sufficient validation data is available. We compare the ICESat‐2 WSS with time‐variable WSS derived from multiple gauges and constant data from the “SWOT River Database.” For 89% of the studied reaches, ICESat‐2 can be used to estimate the average WSS with a median absolute error of 23 mm/km. We also show the possible performance gain at multiple virtual stations (VS) in the “Database for Hydrological Time Series of Inland Waters” (https://dahiti.dgfi.tum.de), applying the WSS as a correction for altimetry satellites' ground track variability. We correct 137 VS for the derived ICESat‐2 WSS and yield improvements in the root mean square error by up to 30 cm or 66%.
    Description: Key Points: Simultaneous obs. from Ice, Cloud, and Land Elevation Satellite 2’s (ICESat‐2's) unique multibeam lidar altimeter are used to estimate instantaneous reach‐scale water surface slope (WSS). For 89% of 815 studied reaches, we find ICESat‐2 can be used to estimate WSS with a median absolute error of 23 mm/km relative to gauge data. We correct water level time series from radar satellite altimetry for the derived WSS and obtain improvements of up to 30 cm (66%) root mean square error.
    Description: DFG, German Research Foundation
    Description: Project DEAL
    Description: https://doi.org/10.5281/zenodo.7098114
    Description: https://doi.org/10.5067/ATLAS/ATL13.005
    Description: https://doi.org/10.5281/zenodo.4917236
    Description: https://dahiti.dgfi.tum.de/
    Keywords: ddc:551.48 ; water surface slope ; river ; ICESat‐2 ; flow gradient ; satellite altimetry
    Language: English
    Type: doc-type:article
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  • 10
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    In:  Deutsches Geodätisches Forschungsinstitut der Technischen Universität München
    Publication Date: 2023-01-13
    Description: Measurements at GPS station FAHR in the Bavarian Alps are part of the Geodetic Alpine Integrated Network (GAIN) of the ALPS-GPSQUAKENET project.
    Type: Dataset
    Format: application/zip, 10 datasets
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