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International Journal of Digital Earth 2023年第1期16卷 251-271页

作者： Kamila Pawłuszek-Filipiak Natalia Wielgocka Damian Tondaś Andrzej Borkowski institute of geodesy and geoinformatics Wroclaw University of Environmental and Life SciencesWroclawPoland

In this study,Differential Interferometric Synthetic Aperture Radar Interferometry(DInSAR)of artificial Corner Reflectors(CRs)were validated in the area of fast and nonlinear deformation gradient caused by active coal longwall *** Sentinel-1 datasets were processed using conventional DInSAR,Persistent Scatterer Interferometry(PSI),and Small BAseline Subset methods implemented in ENVI SARscape™.For evaluation,leveling and Global Navigation Satellite System(GNSS)measurements were *** the challenge of snow cover,the removal of all winter images was not a successful strategy due to the long temporal baseline and strong movement,which cause phase unwrapping problems and underestimate the real *** results indicate that only conventional DInSAR and SBAS with low network redundancy allow us to capture maximal deformation gradient and the root mean square error calculated between the CRs and the ground truth is on the level of 2–3 cm for the vertical and easting deformation component,*** the small deformation gradient represented by the permanent GNSS station(4 cm/year),all SBAS techniques appeared to be more accurate than DInSAR,which corresponds to higher redundancy and better removal of the atmospheric *** contrast,DInSAR results allowed to capture information about two subsidence basins,which was not possible with SBAS and PSI approaches.

关键词： DInSAR PSI SBAS corner reflectors mining deformations nonlinear and significantdeformation phase unwrapping errors

Theoretical Deficiencies of Isostatic Schemes in Modeling the Crustal Thickness along the Convergent Continental Tectonic Plate Boundaries

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Journal of Earth Science 2016年第6期27卷 1045-1053页

作者： Robert Tenzer Mohammad Bagherbandi School of geodesy and Geomatics Wuhan University Division of geodesy and geoinformatics Royal Institute of Technology (KTH) Department of Industrial Development IT and Land ManagementUniversity of G?vle

The results of global and regional studies often show significant disagreement between the Moho depths determined using seismic and isostatic models. In this study, we estimate the differences between these two models in central Eurasia. The Vening Meinesz-Moritz （VMM） inverse problem of isostasy is utilized to determine the isostatic Moho depths. The estimated VMM Moho depths are then corrected for the sediment density contrast. The application of this correction improves the agreement between the isostatic and seismic Moho models. The existing discrepancies between the isostatic and seismic models are finally modeled by applying the non-isostatic correction, which accounts for the unmodelled mantle density heterogeneities and other geodynamic processes, which are not taken into account in classical isostatic models. Our results reveal that the non-isostatic correction still cannot fully describe mechanisms affecting the Moho geometry along the convergent continent-tocontinent tectonic plate boundaries occurring beneath Himalayas despite an overall good performance of the applied method.

关键词： crust gravity Himalaya isostasy Moho interface Tibetan Plateau.

Analysis of mobility data-A focus on Mobile Mapping Systems

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Geo-Spatial Information Science 2020年第1期23卷 68-74页

作者： Monika Sester institute of Cartography and geoinformatics Leibniz Universitat HannoverHannoverGermany

The increasing availability of devices to capture the position of moving objects(and other environmental information)leads to a very large amount and variety of mobility *** order to obtain important information about the objects,their behavior or the environment of the objects,an automatic analysis is *** article highlights current research questions in the context of the analysis of mobility data and presents them on the basis of work carried out at the institute of Cartography and geoinformatics(ikg)at Leibniz University of Hannover,Germany.A focus is put on the analysis and exploitation of information from Mobile Mapping vehicles.

关键词： Trajectories Lidar data automatic analysis traffic applications

Trajectory analysis at intersections for traffic rule identification

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Geo-Spatial Information Science 2021年第1期24卷 75-84,I0010页

作者： Chenxi Wang Stefania Zourlidou Jens Golze Monika Sester institute of Cartography and geoinformatics Leibniz University HannoverHannoverGermany

In this paper,we focus on trajectories at intersections regulated by various regulation types such as traffic lights,priority/yield signs,and right-of-way *** test some methods to detect and recognize movement patterns from GPS trajectories,in terms of their geometrical and spatio-temporal *** particular,we first find out the main paths that vehicles follow at such *** then investigate the way that vehicles follow these geometric paths(how do they move along them).For these scopes,machine learning methods are used and the performance of some known methods for trajectory similarity measurement(DTW,Hausdorff,and Fréchet distance)and clustering(Affinity propagation and Agglomerative clustering)are compared based on clustering ***,the movement behavior observed at six different intersections is analyzed by identifying certain movement patterns in the speed-and time-profiles of *** show that depending on the regulation type,different movement patterns are observed at *** finding can be useful for intersection categorization according to traffic *** practicality of automatically identifying traffic rules from GPS tracks is the enrichment of modern maps with additional navigation-related information(traffic signs,traffic lights,etc.).

关键词： Traffic rules traffic regulators GPS trajectories intersection classification speed-profiles clustering similarity measures

Development of an early warning information infrastructure using spatial web services technology

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International Journal of Digital Earth 2010年第4期3卷 384-394页

作者： Kai Walter Department of geodesy and geoinformatics Institute for Management of Rural AreasFaculty of Agricultural and Environmental SciencesRostock UniversityJustus-von-Liebig-Weg 618059RostockGermany

Current high-performance monitoring and early warning systems are compara-tively expensive and *** project described here aims for a systematic development of a prototypical alarm and early warning system for landslides utilising low-cost ad hoc wireless sensor networks and flexible spatial web service *** web-based services as tools to exchange environmental data is an important step towards addressing today’s larger scale environmental *** project’s information system functions for notification,data access and analysis are implemented utilising Open Geospatial Consortium web service *** to implementing the orchestration of operation workflows and production of near real-time information products are illustrated.

关键词： early warning wireless sensor network Sensor Web Enablement digital earth OGC SLEWS

Study on tidal gravity observations obtained at stations Zhongshan and Changcheng, Antarctic

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Acta Seismologica Sinica(English Edition) 2001年第3期14卷 325-332页

作者： XU Jian-qiao Laboratory of Dynamic geodesy Institute of Geodesy and Geophysics Chinese Academy of Sciences

Based on the international tidal gravity reference values at station Wuhan, the tidal gravity parameters, including the amplitude factors and phase differences are determined accurately by using the observations with three La-Coste-Romberg (LCR) gravimeters (G-589, ET-20 and ET-21) at stations Zhongshan and Changcheng in the Antarctic, respectively. The standard deviations of the determined amplitude factors of the main tidal waves are better than 0.5%. The amplitude of each tidal wave observed at station Zhongshan is much less than that of the same wave at station Changcheng. The differences of amplitude factors in the diurnal band (O1) at these two stations are less than 7% while those in the semi-diurnal band (M2) are larger than 40%. The influences of meteorology factors, such as atmospheric pressure and temperature, on the tidal gravity observations are very obvious. The oceanic loading effects on the tidal gravity are also very prominent. It is found that the amplitude of the final residual vector of every tidal wave reduces significantly after oceanic correction based on the Schwiderski's global co-tides. However, because the local oceanic loading is not taken into account, the discrepancies of amplitude factors of wave O1 observed at Zhongshan from the corresponding values of theoretical tidal model are about 4%, and 9% at Changcheng.

关键词： stations Zhongshan and Changcheng Antarctic tidal gravity observations international tidal gravity reference values theoretical tidal model P223.9

Earth's deformation due to the dynamical perturbations of the fluid outer core

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Acta Seismologica Sinica(English Edition) 2002年第4期15卷 414-424页

作者： XU Jian-qiao (徐建桥) SUN He-ping (孙和平) Key Laboratory of Dynamic geodesy Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 China Key Laboratory of Dynamic Geodesy Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 China

The elasto-gravitational deformation response of the Earths solid parts to the perturbations of the pressure and gravity on the core-mantle boundary (CMB) and the solid inner core boundary (ICB), due to the dynamical behaviors of the fluid outer core (FOC), is discussed. The internal load Love numbers, which are formulized in a general form in this study, are employed to describe the Earths deformation. The preliminary reference Earth model (PREM) is used as an example to calculate the internal load Love numbers on the Earths surface, CMB and ICB, respectively. The characteristics of the Earths deformation variation with the depth and the perturbation periods on the boundaries of the FOC are also investigated. The numerical results indicate that the internal load Love numbers decrease quickly with the increasing degree of the spherical harmonics of the displacement and depend strongly on the perturbation frequencies, especially on the high frequencies. The results, obtained in this work, can be used to construct the boundary conditions for the core dynamics of the long-period oscillations of the Earths fluid outer core.

关键词： dynamical effect of the fluid outer core boundaries of the fluid outer core internal load Love

Monitoring of reclamation-induced ground subsidence in Macao (China) using PSInSAR technique

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Journal of Central South University 2013年第4期20卷 1039-1046页

作者：胡波汪汉胜江利明 State Key Laboratory of Dynamical geodesy (institute of geodesy and Geophysics Chinese Academy of Sciences)

The long-term reclamation-induced ground subsidence in Macao, a coastal city of southern China was investigated. Persistent scatterer interferometry (PSI) technique was applied to retrieve the deformation rate in Macao during the period from April 2003 to August 2010 with a total of 41 scenes of descending ASAR data sets. The PSI-retrieved results show a relatively stable pattern in Macao Peninsula, Taipa Island and Coloane Island, with an average subsidence velocity of -3 mm/a. In contrast, relatively large subsidence rates are highlighted in Cotai area, a new reclamation land in 1990s, in which an average subsidence velocity is about -10 mm/a. A consistent relationship between the PSI results and the leveling measurements indicate that this PSI technique is an effective tool to monitor the reclamation-induced ground subsidence with a high accuracy and adequate spatial details. Accordingly, the valuable ground subsidence results generated by PSI can be used not only for early detection and remedial activities of potential settlement of building, but also for helping the local government to formulate regional sustainable development planning and decision-making in disaster prevention and mitigation.

关键词： persistent scatterer interferometry (PSI) Macao reclamation land ground subsidence

Development of German-Ukrainian cooperations for education and research in photogrammetry and laser scanning

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Geo-Spatial Information Science 2021年第1期24卷 152-159,I0016页

作者： Thomas Luhmann institute for Applied Sciences and geoinformatics Jade University of Applied Sciences OldenburgOldenburgGermany

Since 2011 an intensive international cooperation has been in place between the institute for Applied Photogrammetry and geoinformatics(IAPG)at the Jade University of Applied Sciences in Oldenburg,Germany,and various Ukrainian *** an initial contact by *** Konecny,the first visit was organized,and was followed by many *** subsequent years an intensive cooperation was established particularly with the National University for Construction and Architecture(KNUCA)in *** addition to architects and civil engineers,KNUCA also trains geodesists,geo-information scientists and landscape *** cooperation today includes the reciprocal exchange of scientists and students,research projects,courses and cooperation at many other *** addition,a commercial company has been established,SPM3D LLC,which now employs more than 14 engineers in the field of 3D acquisition,point cloud processing and *** article summarizes the history of the cooperation and presents the results of associated student *** addition,results of joint work on the development of a virtual laser scanner are presented,part of a German-Ukrainian initiative to digitize teaching.

关键词： Internationalization technology transfer curricula reform photogrammetry laser scanning e-learning

Detection of spheriodal free oscillation excited by Peru 8.2 M_(s) earthquake with five international superconducting gravimeter data

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Science China Earth Sciences 2005年第1期48卷 123-133页

作者： LEI Xiang'e XU Houze SUN Heping Key Laboratory of Dynamic geodesy Institute of Geodesy and Geophysics. Chinese Academy of Sciences Wuhan 430077 China Key Laboratory of Dynamic Geodesy Institute of Geodesy and Geophysics. Chinese Academy of Sciences Wuhan 430077 China Key Laboratory of Dynamic Geodesy Institute of Geodesy and Geophysics. Chinese Academy of Sciences Wuhan 430077 China

In this paper, authors obtain the spectral peaks of the earth free oscillation and check all normal modes from 0S0 to 0S48 accurately, with the Fourier analysis and the maximum entropy spectrum method dealing jointly with six groups of the observational residual data from five international superconducting gravimeter stations. By comparing the observational results in this paper with three former groups of observations or models, authors notice an extra discrepancy between two observational 0S2 modes excited separately by Peru earthquake and Alaska earthquake, which probably mirrors the anisotropy of the Earth's inner core. The analysis on the splitting 1S2 mode shows that the asymmetric factor of rotationwise spectral splitting is possible to be different from that of anti-rotationwise spectral splitting.

关键词： 8.2 Ms Peru earthquake, detection of Earth free oscillation, observation of superconducting gravimeter,anisotropy of earth's inner core.