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    Wyświetlanie 1-3 z 3
    Tytuł:
    Deformation analysis in central west Bulgaria using triangulation and GPS data
    Autorzy:
    Dimitrov, Nikolay
    Powiązania:
    https://bibliotekanauki.pl/articles/106859.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    deformation analysis
    GNSS
    triangulation
    active tectonics
    analiza deformacji
    triangulacja
    tektonika
    Opis:
    The article discusses a method applied for combining the results of Global Navigation Satellite Systems (GNSS) and 75-year old triangulation measurements to estimate the crustal movements in central western Bulgaria region. It was examined for joint analysis based on the results of GNSS with angular measurements of the first order triangulation network in Bulgaria during the period 1923–1930 year. As a result of the processing of GNSS and angular measurements, horizontal velocities of 15 points, strain rates, and rotation rates have been obtained. The results show dominating N–S extension at a rate of 1–2 mm/y and the deformation is not uniformly distributed over the studied area. The obtained results indicate the possibility of using old angular measurement of first-order triangulation points, together with GNSS data, to obtain estimates of the horizontal crustal movements.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2019, 108; 23-26
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method for local approximation of a planar deformation field
    Autorzy:
    Ligas, Marcin
    Banaś, Marek
    Szafarczyk, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/106795.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    deformation analysis
    polar decomposition
    affine transformation
    rotation matrix
    stretch tensor
    analiza deformacji
    rozkład biegunowy operatora
    transformacja afiniczna
    macierz obrotu
    Opis:
    We present a method of approximation of a deformation eld based on the local ane transformations constructed based on n nearest neighbors with respect to points of adopted grid. The local ane transformations are weighted by means of inverse distance squared between each grid point and observed points (nearest neighbors). This work uses a deformation gradient, although it is possible to use a displacement gradient instead – the two approaches are equivalent. To decompose the deformation gradient into components related to rigid motions (rotations, translations are excluded from the deformation gradient through dierentiation process) and deformations, we used a polar decomposition and decomposition into a sum of symmetric and an anti-symmetric matrices (tensors). We discuss the results from both decompositions. Calibration of a local ane transformations model (i.e., number of nearest neighbors) is performed on observed points and is carried out in a cross-validation procedure. Verication of the method was conducted on simulated data-grids subjected to known (functionally generated) deformations, hence, known in every point of a study area.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2019, 108; 1-8
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of deformations of the skylight construction at the Main Hall of the Warsaw University of Technology
    Autorzy:
    Odziemczyk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/106872.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    TPS1200
    total station
    analysis of deformation
    skylight construction
    automation
    Warsaw University of Technology
    tachimetr
    analiza deformacji
    konstrukcja świetlika
    automatyka
    Politechnika Warszawska
    Opis:
    The paper presents technology and results of measurements of the steel construction of the skylight of the Main Hall of the Warsaw University of Technology. The new version of the automated measuring system has been used for measurements. This system is based on Leica TCRP1201+ total station and the TCcalc1200 software application, developed by the author, which operates on a laptop computer connected with the total station by the wire. Two test measurements were performed. Each of them consisted of cyclic measurement using the polar method, from one station; points located on the skylight construction, as well as control points located on concrete, bearing poles, were successively measured. Besides geometrical values (such as Hz, V angles and the slope distance D), the changes of temperature and atmospheric pressure, were also recorded. Processed results of measurements contained information concerning the behaviour of the skylight; asymmetry of horizontal displacements with respect to the X axis have been proved. Changes of parameters of the instrument telescope and changes of the instrument orientation were also stated; they were connected with changes of the temperature. The most important results of works have been presented in the form of diagrams.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2014, 97; 35-46
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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