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    Wyświetlanie 1-7 z 7
    Tytuł:
    Geodynamic research at the Department of Planetary Geodesy, SRC PAS
    Autorzy:
    Brzeziński, A.
    Jóźwik, M.
    Kaczorowski, M.
    Kalarus, M.
    Kasza, D.
    Kosek, W.
    Nastula, J.
    Szczerbowski, Z.
    Wińska, M.
    Wronowski, R.
    Zdunek, R.
    Zieliński, J. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/106813.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    Department of Planetary Geodesy
    geodynamic research
    Wydział Geodezji Planetarnej
    badania geodynamiczne
    Opis:
    The Department of Planetary Geodesy of the Space Research Centre PAS has been conducting research on a broad spectrum of problems within a field of global dynamics of the Earth. In this report we describe the investigations on selected subjects concerning polar motion (modeling and geophysical interpretation of the Chandler wobble, hydrological excitation of seasonal signals, search for optimal prediction methods), tectonic activity in the region of the Książ Geodynamic Laboratory of the SRC, and finally the new joint Polish-Italian project GalAc analyzing feasibility and usefulness of equipping second-generation Galileo satellites with accelerometers.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2016, 100; 131-147
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corretions to sea level anomalies data due to geocenter motion
    Autorzy:
    Kosek, W.
    Wnęk, A.
    Zbylut-Górska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/100238.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
    Tematy:
    geocenter
    sea level anomalies
    wavelet-based semblance filtering
    nieprawidłowości poziomu morza
    morze
    poziom morza
    Opis:
    The objective of this paper is computation of the corrections to sea level anomaly data due to center of Earth mass variations. The geocenter motion model was computed from the center of mass coordinates data determined from observations of space geodetic techniques such as Satellite Laser Ranging (SLR), Global Navigation Satellite System (GNSS) and Doppler Orbitography and Radiopositionig Integrated on Satellite (DORIS). In order to compute the geocenter motion model the center of mass coordinates data were filtered using wavelet based semblance filtering which allows computing a common signal in two time series. Based on determined geocenter motion model a correction to sea level anomalies (SLA) data due to geocenter motion was determined. This kind of correction to sea level anomaly data is of the order of few millimetres and should be applied to altimetric measurements to refer them to the International Terrestrial Reference Frame (ITRF) Origin considered as the center of figure.
    Źródło:
    Geomatics, Landmanagement and Landscape; 2015, 2; 33-44
    2300-1496
    Pojawia się w:
    Geomatics, Landmanagement and Landscape
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Earth rotation and geodynamics
    Autorzy:
    Bogusz, J.
    Brzezinski, A.
    Kosek, W.
    Nastula, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/145392.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    GNSS
    SLR
    tidal investigations
    Earth's magnetic field
    Earth rotation
    ruch obrotowy Ziemi
    pole magnetyczne
    pływy morskie
    Opis:
    This paper presents the summary of research activities carried out in Poland in 2011-2014 in the field of Earth rotation and geodynamics by several Polish research institutions. It contains a summary of works on Earth rotation, including evaluation and prediction of its parameters and analysis of the related excitation data as well as research on associated geodynamic phenomena such as geocentre motion, global sea level change and hydrological processes. The second part of the paper deals with monitoring of geodynamic phenomena. It contains analysis of geodynamic networks of local, and regional scale using space (GNSS and SLR) techniques, Earth tides monitoring with gravimeters and water-tube hydrostatic clinometer, and the determination of secular variation of the Earth’ magnetic field.
    Źródło:
    Geodesy and Cartography; 2015, 64, 2; 201-242
    2080-6736
    2300-2581
    Pojawia się w:
    Geodesy and Cartography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical geodesy
    Autorzy:
    Borkowski, A.
    Kosek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/145440.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    M-estimation
    robust estimation
    reliability
    time series
    polar motion
    niezawodność
    szeregi czasowe
    estymacja
    Opis:
    The paper presents a summary of research activities concerning theoretical geodesy performed in Poland in the period of 2011-2014. It contains the results of research on new methods of the parameter estimation, a study on robustness properties of the M-estimation, control network and deformation analysis, and geodetic time series analysis. The main achievements in the geodetic parameter estimation involve a new model of the M-estimation with probabilistic models of geodetic observations, a new Shift-Msplit estimation, which allows to estimate a vector of parameter differences and the Shift-Msplit(+) that is a generalisation of Shift-Msplit estimation if the design matrix A of a functional model has not a full column rank. The new algorithms of the coordinates conversion between the Cartesian and geodetic coordinates, both on the rotational and triaxial ellipsoid can be mentioned as a highlights of the research of the last four years. New parameter estimation models developed have been adopted and successfully applied to the control network and deformation analysis. New algorithms based on the wavelet, Fourier and Hilbert transforms were applied to find time-frequency characteristics of geodetic and geophysical time series as well as time-frequency relations between them. Statistical properties of these time series are also presented using different statistical tests as well as 2nd, 3rd and 4th moments about the mean. The new forecasts methods are presented which enable prediction of the considered time series in different frequency bands.
    Źródło:
    Geodesy and Cartography; 2015, 64, 2; 261-279
    2080-6736
    2300-2581
    Pojawia się w:
    Geodesy and Cartography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    HydroProg: a system for hydraulic forecasting in real time, based on the multimodelling approach
    Autorzy:
    Niedzielski, T.
    Miziński, B.
    Kryza, M.
    Netzel, P.
    Wieczorek, M.
    Kasprzak, M.
    Migoń, P.
    Szymanowski, M.
    Jeziorska, J.
    Witek, M.
    Kosek, W
    Powiązania:
    https://bibliotekanauki.pl/articles/108558.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
    Tematy:
    hydrology
    ensemble prediction
    multimodelling
    real time prognosis
    Kłodzko District
    Opis:
    Aleja Mickiewicza 24/28, 30-059 Kraków, Poland Abstract: The objective of this paper is to present the concept of a novel system, known as HydroProg, that aims to issue flood warnings in real time on the basis of numerous hydrological predictions computed using various models. The core infrastructure of the system is hosted by the University of Wrocław, Poland. A newly-established computational centre provides in real time, courtesy of the project Partners, various modelling groups, referred to as “project Participants”, with hydrometeorological data. The project Participants, having downloaded the most recent observations, are requested to run their hydrologic models on their machines and to provide the HydroProg system with the most up-to-date prediction of riverflow. The system gathers individual forecasts derived by the Participants and processes them in order to compute the ensemble prediction based on multiple models, following the approach known as multimodelling. The system is implemented in R and, in order to attain the above-mentioned functionality, is equipped with numerous scripts that manipulate PostgreSQL- and MySQL-managed databases and control the data quality as well as the data processing flow. As a result, the Participants are provided with multivariate hydrometeorological time series with sparse outliers and without missing values, and they may use these data to run their models. The first strategic project Partner is the County Office in Kłodzko, Poland, owner of the Local System for Flood Monitoring in Kłodzko County. The experimental implementation of the HydroProg system in the Nysa Kłodzka river basin has been completed, and six hydrologic models are run by scientists or research groups from the University of Wrocław, Poland, who act as Participants. Herein, we shows a single prediction exercise which serves as an example of the HydroProg performance.
    Źródło:
    Meteorology Hydrology and Water Management. Research and Operational Applications; 2014, 2, 2; 65-72
    2299-3835
    2353-5652
    Pojawia się w:
    Meteorology Hydrology and Water Management. Research and Operational Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Required Data Span to Detect Sea Level Rise
    Autorzy:
    Niedzielski, T.
    Kosek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/117439.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Sea Level
    Meteorological Aspects
    Oceanography
    Sea Level Anomalies (SLA)
    Seasonal Oscillations
    Climate Theory
    Climate Changes
    Prediction Technique
    Opis:
    Altimetric measurements indicate that the global sea level rises about 3 mm/year, however, in various papers different data spans are adopted to estimate this value. The minimum time span of TOPEX/Poseidon (T/P) and Jason-1 (J-1) global sea level anomalies (SLA) data required to detect a statisti-cally significant trend in sea level change was estimated. Seeking the trend in the global SLA data was per-formed by means of the Cox-Stuart statistical test. This test was supported by the stepwise procedure to make the results independent of the starting data epoch. The probabilities of detecting a statistically significant trend within SLA data were computed in the relation with data spans and significance levels of the above-mentioned test. It is shown that for the standard significance level of 0.05 approximately 5.5 years of the SLA data are required to detect a trend with the probability close to 1. If the seasonal oscillations are removed from the combined T/P and J-1 SLA data, 4.3 years are required to detect a statistically significant trend with a probability close to 1. The estimated minimum time spans required to detect a trend in sea level rise are ad-dressed to the problem of SLA data predictions. In what follows, the above-mentioned estimate is assumed to be minimum data span to compute the representative sample of SLA data predictions. The forecasts of global mean SLA data are shown and their mean prediction errors are discussed.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 2; 143-147
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An influence of wide-band oscillations in pole coordinates caused by atmospheric, ocean and hydrology excitation functions on their prediction errors
    Autorzy:
    Kosek, W
    Popiński, W.
    Rzeszótko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/225167.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    pomiary
    EOP
    rotacja Ziemii
    measurements
    rotation of Earth
    Źródło:
    Reports on Geodesy; 2008, z. 2/85; 37-47
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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