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1
Content available remote Unmodelled effects in the horizontal velocity field determination: ASG-EUPOS case study
Bogusz J., Figurski M., Kontny B., Grzempowski P.
Artificial Satellites : Journal of Planetary Geodesy
|
2012
|
Vol. 47, No. 2
67--79
EN
Recent space and satellite technologies offer great opportunities to determine crustal movements in the single, global reference frame. The densification of the global network through local area networks leads to increase the resolution of modelled deformations both horizontal and vertical. However, the credibility of the obtained velocity field is limited by several factors associated with unmodelled (or mismodelled) effects at the stage of GNSS data adjustment. Some of them are periodic (the influence of local atmospheric or hydrological impacts), some temporary (natural or anthropogenic seismicity) or related to local influences (snow load or effects associated with the freezing of the ground). This paper presents the usefulness of ASG-EUPOS time series for determination of the regional velocity field. The system has been operating since mid-2008, so the velocities obtained through the processing of 3-year time series are supposed to be reliable. The paper also presents comparison of the velocity determinations to the geological NNR-NUVEL-1A and geodetic APKIM2005 models.
2
Content available Use of mems technology in mass wasting research
Ćmielewski B., Kontny B., Ćmielewski K.
Reports on Geodesy
|
2011
|
z. 1/90
85-92
EN
Mass movements are a major threat to human life. Their growth depends on many factors. The main factor causing the surface mass wasting is the gravitational force, but the conditions in which this force can act, arise in different ways: it may be undercutting of slopes by erosion or weathering, deep relaxation of the layers forming the edge or slope overload by rain or snow. Often, all these factors interact. The material speed movement down a slope can be very slow, in the manner that is difficult to observe as well as suddenly and violently at a high speed. Methods permitting the monitoring of areas at risk of movement are geodetic, geptechnical and geophisical technics. The most popular method to investigate the movements of the soil layers is to use the inclinometer probe. However, this application requires a large effort involving the execution of specific wells, set up columns and the most expensive item inclinometer probe. Measurements using this technique are periodic and not fully reflect the processes occurring beneath the surface. To improve result several probes can be connected together, admitted to the same hole and registering readings in a real time. The cost of installation often exceeds the project budget. In this paper authors want to put attention to the possibility of using miniature measuring devices such as accelerometers, which are working in low -g š2g, to detect the force of Earth's gravity, distributed into three axis X, Y, Z. This allows calculating the direction of the deflection from X, Y axis and the deviation from the vertical line.
3
Content available Terrestrial laser scanner technic as a method for identification deformation areas of slops
Ćmielewski B., Kontny B.
Reports on Geodesy
|
2011
|
z. 1/90
77-84
EN
Modern methods of determining the deformation of superficial objects, not monolithic, such as a slope, are based on observations of both sources: geodetic and geotechnical data. Surveying methods require investment in dense network of control points, which does not fully reflect the nature of occurring changes. This is the nature of the point observation and non-optimal distribution of points resulting from insufficient geological substrate. Geotechnical measurements also represent the point nature of the occurring changes.
4
Content available "ASG+": Project for improving Polish Multifunctional Precise Satellite Positioning System
Figurski M., Bogusz J., Bosy J., Kontny B., Krankowski A., Wielgosz P.
Reports on Geodesy
|
2011
|
z. 2/91
51-57
5
Content available Wykrywanie sygnałów skokowych w szeregach czasowych zmian współrzędnych GPS
Kontny B.
Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum
|
2011
|
Vol. 10, nr 3
5-17
PL
W pracy zaprezentowano zmodyfikowaną metodę różnicową wykrywania zmian skokowych w dyskretnych sygnałach pomiarowych (np. szeregach czasowych zmian współrzędnych punktów GPS) w obecności zakłóceń sygnału przypadkowym szumem pomiarowym (white noise) oraz obserwacji odstających (outliers). Metoda polega na zastąpieniu średniej ruchomej w klasycznym algorytmie metody różnicowej poprzez medianę, przez co w znacznym stopniu ogranicza się wpływ obserwacji odstających. Metodę przetestowano na symulowanych sygnałach pomiarowych. Jak wykazały obliczenia testowe, metoda jest skuteczna nawet dla stosunkowo wąskiego okna po stronie obserwacji następujących po testowanej i-tej epoce pomiarowej. Pozwala to na stosunkowo szybkie alarmowanie o zaistnieniu zmiany skokowej o amplitudzie nawet na granicy szumu pomiarowego (3 sigma). Metoda może znaleźć zastosowanie w automatycznych systemach kontrolno-pomiarowych do monitorowania przemieszczeń obiektów inżynierskich wykorzystujących satelitarny system GPS, w szczególności do monitorowania deformacji obiektów hydrotechnicznych, przemysłowych i górniczych.
EN
A modified differencing method of the detection of irregular jumping changes in discrete measuring signals (e.g. time series of changes of coordinate points GPS) in the presence of disruptions of the signal with random measuring noise (white noise) and of accidental diverging observations (outliers) was shown at the work. The method consists in replacing the moving average in the classic algorithm of the differencing method through the median, what to a considerable degree the influence of diverging observation is being limited by. The method was tested on simulated measuring signals. How the test calculations demonstrated, the method is effective even for relatively narrow window on the side of following observations after tested measuring epoch. It allows on relatively fast alarming because of becoming known the irregular change about the amplitude even on the border of measuring noise (3 sigma). The method can find application in automatic control-measuring systems using the satellite system GPS for displacement monitoring of engineering objects, in particular for monitoring of hydro technical, industrial and mining objects’ deformations.
6
Content available remote Szkoła, akademia, uniwersytet
Kontny B.
Geodeta : magazyn geoinformacyjny
|
2010
|
nr 8
55-57
7
Content available Modelowanie ruchu stacji EPN/IGS "Wrocław" na podstawie analizy ciągów czasowych obserwacji GPS
Kontny B., Szwed S., Zając M.
Geomatics and Environmental Engineering
|
2007
|
Vol. 1, no. 1/1
141-155
PL
W artykule poddano analizie szeregi czasowe współrzędnych z okresu 9 lat istnienia permanentnej stacji GPS "Wrocław". Badane szeregi zostały zbudowane z tygodniowych rozwiązań sieci EPN. Analiza została przeprowadzona w celu identyfikacji charakteru ruchu punktu "WROC" oraz wyznaczenia składowych prędkości tego ruchu. Założono przy tym trzy modele ruchu punktu: model liniowy, w którym punkt porusza się ruchem jednostajnym ze stałą prędkością w czasie (wykorzystując do wyznaczenia współczynników modelu liniowego metodę odporną na błędy grube); model, w którym położenie punktu ulega okresowym zmianom oraz model z przemieszczeniem epizodycznym, czyli skokową zmianą współrzędnych. Uzyskane wyniki poddano analizie, w wyniku której można sformułować następujące wnioski: 1) Na model ruchu liniowego składa się głównie prędkość dryftu eurazjatyckiej płyty kontynentalnej. Po odjęciu tego ruchu zostaje prędkość rezydualna (wewnątrzpłytowa), która wynosi ok. 1,5 mm/rok w kierunku NW. 2) W wyniku analizy spektralnej stwierdzono cykliczne zmiany położenia punktu "WROC". Dla wszystkich współrzędnych (N, E, U) istotne składowe cykliczne mają charakter długookresowy. Dominują składowe 9- i 4,5-letnie o amplitudzie 1,2 mm i 2,2 mm, odpowiednio dla współrzędnych horyzontalnych N i E oraz 4,0 mm dla współrzędnej wertykalnej. 3) Nie stwierdzono skokowych zmian współrzędnych (przemieszczeń epizodycznych) punktu "WROC". Fakt ten potwierdza przydatność tego punktu do badań geodynamicznych.
EN
Studied time series was formed from EPN Network weekly solutions. The identification of the movement character and movement velocity estimation were the aims of the analysis. Three models of the point's movement were assumed: linear model with invariable velocity monotonous movement (using robust estimation for linear model coefficients determination); model in which point location periodically changes and model with episodic displacement, or with coordinate jump. Results were analyzed and interpreted resulting following conclusions: 1. Linear model parameters consist of mainly Euro-Asiatic continental plate velocity. Residual (intraplate) velocity remains up to 1.5 mm/y NW after removing plate movement. 2. Periodic changes of "OC" point location were confirmed by results of spectral analysis. Periodical components for all coordinates have a character of long period oscillations. 9 and 4.5 year component dominates with amplitude 1.2 mm/y and 2.2 mm/y for horizontal coordinates, N and E respectively and 3.8 mm/y for vertical one. 3. Coordinate jumps (episodic displacements) were not detected for "WROC" station. The usefulness of this station for geodynamic studies was confirmed.
8
Content available The Earth crust surface movements in SW Poland from GPS and leveling data
Bosy J., Kontny B., Cacon S.
Reports on Geodesy
|
2006
|
z. 1/76
301-311
EN
Permanent and periodic satellite GPS observations in SW Poland are realized since 1996. The results of these observations are used for the earth crust surface movements determination. Values of the movement velocities are significant for horizontal as well as vertical components. The vertical movements determined by GPS were compared with the vertical movements obtained by repeated leveling measurements, performed in the 50'ties, 70'ties and 90'ties of the 20th Century. The calculated movements are discussed in relation to tectonics in the paper.
9
Content available remote Recent tectonic activity in the Eastern Sudetes and on the Fore-Sudetic Block on the basin of 1993-2003 investigations
Cacoń S., Bosy J., Kontny B.
Reports on Geodesy
|
2006
|
z. 4/79
309-323
EN
The characteristics of geodynamic investigations in the Eastern Sudetes and the Fore-Sudetic Block region during the 1993-2003 period are presented. The investigations included repeated GPS, gravimetric and other observations realised in three local research areas and a regional network. The local research networks have been integrated into the regional network through selected points. The regional network has been connected to the permanent stations network EPN/IGS. This has allowed calculation of the points' velocities in a uniform reference frame ITRF2000. The calculated movement parameters of points have been the basis for estimating the kinematics of tectonic structures including gravity changes. The results have confirmed recent activity of the young tectonic structures in research region.
10
Content available remote Local geodynamic researches in Sudetes and the Mediterranean Region
Cacoń S., Kontny B., Bosy J., Cello G., Piccardi L, Tondi E., Drakatos G., Ganas A.
Reports on Geodesy
|
2006
|
z. 4/79
333-346
EN
The general characteristics of local tectonic movements studies basing on the self-developed monitoring system are presented in the paper. The system has been installed on some selected objects in the Sudetes (e.g. "Snieznik Massif and "Dobromierz") and in the Mediterranean basin ("Gargano" and "Norcia" in Italy, "Kaparelli" in Greece). These research areas are located in zones characterised with different magnitudes of recent tectonic activity. The main attention is given to organisation standards of the research network and monitoring of movements using GPS. The accuracy analysis of repeated GPS observations with respect to tectonic movements detection is also presented.
11
Content available remote Deformation analysis of the Polish Sudetes and Fore-Sudetic Block
Cacoń S., Vyskocil P., Talich M., Kontny B., Bosy J.
Reports on Geodesy
|
2006
|
z. 4/79
325-332
EN
Geodynamic studies of the Polish Sudetes and the Fore-Sudetic Block in the GEOSUD network have been conducted since the 1996. The results of these studies have allowed establishing horizontal movements of the research network's points, presented in several publications by the authors. This work describes the analyses of the results of repeated measurements concerning determination of surface deformation parameters. The results are discussed with reference to previously given information as well as dynamic properties of surrounding areas.
12
Content available remote Local geodynamic researches in Sudetes and the Mediterranean Region
Cacoń S., Kontny B., Bosy J., Cello G., Piccardi L., Tondi E., Drakatos G., Ganas A.
Reports on Geodesy
|
2005
|
z. 2/73
231-244
EN
The general characteristics of local tectonic movements studies basing on the selfdeveloped monitoring system are presented in the paper. The system has been installed on some selected objects in the Sudetes ("Snieznik Massif" and "Dobromierz") and in the Mediterranean basin ("Gargano" and "Norcia" in Italy, "Kaparelli" in Greece).These research areas are located in zones characterised with different magnitudes of recent tectonic activity and monitoring of movements using GPS. The accuracy analysis of repeated GPS observations with respect to tectonic movements detection is also presented.
13
Content available remote Deformation analysis of the Polish Sudetes and Fore-Sudetic Block
Cacoń S., Vyskocil P., Talich M., Kontny B., Bosy J.
Reports on Geodesy
|
2005
|
z. 2/73
211-219
EN
Geodynamic studies of the Polish Sudetes and the Fore-Sudetic Block in the GEOSUD network have been conducted since the 1996. The results of these studies have allowed establishing horizontal movements of the research network`s points, presented in several publications by the authors. This work describes the analyses of the results of repated measurements concerning determination of surface deformation parameters. Theresults are discussed with reference to previously given information as wellas dynamic properties of surrounding areas.
14
Content available remote Recent tectonic activity in the Eastern Sudetes and on the fore-sudetic block on the basis of 1993-2003 investigations
Cacon S., Bosy J., Kontny B.
Reports on Geodesy
|
2004
|
nr 2/69
197--211
EN
The characteristics of geodynamic investigations in the Eastern Sudetes and the Fore-Sudetic Block region during the 1993-2003 period are presented. The investigations included repeated GPS, gravimetric and other observations realized in three local research areas and a regional network. The local research networks have been integrated into the regional network through selected points. The regional network has been connected to the permanent stations network EPN/IGS. This has allowed calculation of the points' velocities in a uniform reference frame ITRF2000. The calculated movement parameters of points have been the basis for estimating the kinematics of tectonic structures including gravity changes. The results have confirmed recent activity of the young tectonic structures in research region.
15
Content available remote Recent tectonic activity in the Eastern Sudetes and on the fore-sudetic block on the basis of 1993-2003 investigations
Cacon S., Bosy J., Kontny B.
Reports on Geodesy
|
2004
|
nr 4/71
175--189
EN
The characteristics of geodynamic investigations in the Eastern Sudetes and the Fore-Sudetic Block region during the 1993-2003 period are presented. The investigations included repeated GPS, gravimetric and other observations realised in three local research areas and a regional network. The local research networks have been integrated into the regional network through selected points. The regional network has been connected to the permanent stations network EPN/IGS. This has allowed calculation of the points' velocities in a uniform reference frame ITRF2000. The calculated movement parameters of points have been the basis for estimating the kinematics of tectonic structures including gravity changes. The results have confirmed recent activity of the young tectonic structures in research region.
16
Content available remote Recent activity of main tectonic zones in Polish Sudety Mts. and Fore-Sudetic Block
Cacoń S., Kontny B., Bosy J.
Reports on Geodesy
|
2003
|
z. 1/64
93-102
EN
Sudety Mts. and Fore-Sudetie Block constitute NE edge of the Bohemian Massif. Several large tectonic zones including the Sudetic Marginal Fault divide this area. Results or geodetic and seismic investigations show continuing tectonic movements that were at their peak in Neogene. During the 90-ties of 20th century, geodynamic investigations in this region intensified. Studies base on repeated satellite GPS measurements, gravimetric and relative (crack gauge) observations. This work focuses on presenting the conclusions or research carried out within the GEOSUD and GEOSUD II projects and concerns analysis or geometric, as well as, gravity changes on selected geodynamic profiles. Results obtained confirm recent activity or investigated tectonic zones.
17
Content available remote The GPS geodynamic network East Sudeten
Schenk V., Cacoń S., Bosy J., Kontny B., Kottnauer P., Schenková Z.
Reports on Geodesy
|
2002
|
z. 1/61
69-72
18
Content available remote GPS Network "Sudeten"- preliminary results of the Campaign s 1998-1999
Schenk V., Cacoń S., Bosy J., Kontny B., Kottnauer P., Schenkova Z.
Reports on Geodesy
|
2000
|
z. 7/53
25-33
EN
The geodynamical GPS network SUDETEN covers the area Middle- and East-Sudeten Mts. and Sudeten Foreland and links togetber existing Czech and Polish local GPS networks in this area. The Polish part of this network includes selected sites of the network GEOSUD, established by Department of Geodesy and Photogrammetry of Agricultural University of Wrocław in 1996. The Czech part consists mainly of the network SILESIA built in 1997 by the Institute of Rock Structure and Mechanics of the Academy of Sciences in Prague. The first joint GPS observation campaign on both networks was performed in August 1997, the second one in September 1998 and the third one in September 1999. Results of the first two campaigns were presented on the 1st Czech-Polish Workshop on "Recent Geodynamics of the East Sudeten and Adjacent Areas" in Ramzova (Schenk et al., 1999). A methodology of the GPS satellite signals monitoring applied in the last two campaigns allows errors in the horizontal direction 2 mm and in the vertical direction 5-6 mm not to be exceeded. The GPS observation data of all campaigns were processed using Bernese GPS Software v. 4.2. The network was linked to three EUREF permanent stations (GOPE, PENC and BOR1) and their data were included to the processing. The preliminary results concerning the first geodynamical evidences in the Sudeten Mts. obtained from the GPS data.
19
Content available remote Geodynamic GPS Network "Geosud" - preliminary results of the Campaigns 1997-1999
Kontny B., Bosy J., Cacoń S.
Reports on Geodesy
|
2000
|
z. 7/53
43-49
EN
Geodynamic investigations in Sudetes and Fore-Sudetic Block have been started in 1992 on the three geodynamic ragnes (Śniżnik Massif, Paczków Graben and Stolowe MTS.). Part of the research points established on these ranges, as well as some new points constitute 14-point "GEOSUD" network. Satellite GPS measurements in this network started in 1996. In this paper initial geometrical interpretation of GPS measurement results carried out in 1997, 1998 and 1999 is presented.
20
Content available remote Strategy of GPS data processing in local geodynamic networks
Bosy J., Kontny B.
Reports on Geodesy
|
1998
|
z. 9/39
105-113
EN
Geodynamic research investigations realised by the Department of Geodesy and Photogrammetry, Agricultural University of Wrocław, based on yearly repeated satellite observations of local GPS networks. Localisation of the observation points adapted to specific geological and tectonic conditions caused big differences of base line lengths. Geometrical heterogeneity of the networks needs specific strategy of observation, planning and processing of data (data from different receivers, network construction, ambiguity solution, ionosphere and troposphere modelling, normal equation solution, linking with EUREF/IGS permanent stations and distribution of results). In the paper, the results of GPS data processing of geodynamic research sites: GEOSUD, PACZKÓW TECTONIC TROUGH and ŚNIEŻNIK, using BERNESE v4.0 software, are presented.
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