Papers by Adam Lyszkowicz
K e y w o r d s: levelling networks, random errors, systematic errors. A b s t r a c t Paper pres... more K e y w o r d s: levelling networks, random errors, systematic errors. A b s t r a c t Paper presents statistical evaluation of accuracy of levelling network measured in Poland in years 1999–2001. The analysis was done using 16 150 misclosures from the double levelling of the sections, 382 misclosures from the double levelling of the lines and 133 loops misclosures. The statistical analysis was conducted by the regression method, correlation method and the analysis of variance. It results that the measured height differences have various accuracy (analysis of variance), and that systematic errors are changing according to the value and sign. The existence of systematic errors causes that the successive neighboring sections of some levelling lines are correlated. The correlation in the majority of the lines is not statistically essential.
Abstract. The paper describes very shortly first, second and third levelling campaign in Poland a... more Abstract. The paper describes very shortly first, second and third levelling campaign in Poland and gives accuracy of these networks estimated by Lallemand’s formula. Next the fourth precise levelling network measurements from 1999 to 2003 are analysing using Lallemand’s and Vignal’s formulas. The obtained results are compared with the values taken from the previous campaigns. It is seen that in Polish successive campaigns the random errors decreased radically, whereas the systematic errors remained almost the same. As an alternative the fourth levelling campaign was estimated by the methods of variance and covariance analysis, which shows that the lines are contaminated by systematic errors. 1
Remote Sensing, 2021
The Space Research Centre in Warsaw is participating in the ESA project “Geodetic SAR for Height ... more The Space Research Centre in Warsaw is participating in the ESA project “Geodetic SAR for Height System Unification and Sea Level Research”. To observe the absolute sea level and enable the unification of the height systems, the physical heights of the tide gauge stations referring to a common equipotential surface (quasigeoid/geoid) are needed. This paper describes the new quasigeoid model for the area of the Baltic sea. The quasigeoid calculation was carried out according to the Helmert method, in which the topography is condensed on a layer lying on the geoid. Airborne gravity anomalies from the Baltic area and terrestrial anomalies from Sweden, Finland, Denmark, Lithuania, Latvia, and Poland were used. The necessary terrain corrections have been computed from a digital terrain model based on the SRTM30 model. To compute the long-wavelength part of the quasigeoid, the geopotential models GOCE-DIR6, GOCO06s, and EIGEN-6C4 were used; therefore, the three solutions have been obtaine...
Satellite radar altimetry is a successful technique for monitoring elevations of continental surf... more Satellite radar altimetry is a successful technique for monitoring elevations of continental surface water. The surface water level is measured within a terrestrial reference frame with a repeatability varying from 10 to 35 days depending on the orbit cycle of the satellite. With several decades of technique refinement; current data processing can be fairly simple or complex depending on the mission and the tracking methods. Data acquisition is not affected by weather conditions; but the technique can have a number of limitations. However; the technique is sufficiently advanced to have allowed a number of inland water case studies. Focusing on the large lakes; the links between lake evolution and the local climate cycle on seasonal to interannual timescales can be explored; and water storage balance for water management also can be brought into focus. This article reviews present day lake level monitoring and the case study of the Łebsko lake in Poland. First the basic principle of ...
Evaluation of Altimetry Data in the Baltic Sea Region for Computation of New Quasigeoid Models over Poland
The paper presents the comparison and validation of currently available gravity anomalies from th... more The paper presents the comparison and validation of currently available gravity anomalies from the satellite altimetry models with the shipborne and airborne gravity anomalies along the Polish coast and in the Baltic Sea. The mean value of differences between the investigated DTU10 and GMG V24.1 altimetry-derived models is equal to 0.02 mGal. However, significant differences can be seen in the coastal areas. Shipborne and airborne marine gravity datasets, collected over the past 65 years by various institutions, were also compared.
In the time of Middle Ages, both in Poland and in many different countries of Europe, the knowled... more In the time of Middle Ages, both in Poland and in many different countries of Europe, the knowledge was passed on to the next generations orally. In the time of Renaissance, the invention of the printing had changed this situation. In Poland first surveyor's book was written in Latin by Martin from Zurawica in 1450. In the present work, development of the geodetic literature for the period 1450 -1850 is described. The sources which were used in the study, comprise the old manuscripts, old hand writings and rare following editions. In total, 19 geodetic books were described giving their title, the authors, year of the printing, the place of storage and the short description of the content together with a suitable drawings.
Streszczenie. W pracy przedstawiono wyniki testowania nowego modelu pola grawitacyjnego Ziemi EGM... more Streszczenie. W pracy przedstawiono wyniki testowania nowego modelu pola grawitacyjnego Ziemi EGM08, który ostatnio został udostępniony przez US National Geospatiat Intelligence Agency. Do testowania modelu EGM08 i innych modeli geopotencjału wykorzystano satelitarną sieć POLREF pokrywającą w sposób równomierny cały obszar kraju oraz precyzyjny trawers założony przez Instytut Geodezji i Kartografii w latach 2003-2004. Punkty sieć POLREF oraz trawersu zostały dowiązane do polskiej sieci niwelacji precyzyjnej. Wyniki badań ujawniają, że model EGM08 w porównaniu z modelem EGM96 daje istotną poprawę (więcej niż 80%) zgodności między wysokościami quasi-geoidy z modelu EGM08, wysokościami elipsoidalnymi i wysokościami normalnymi w porównaniu z poprzednimi modelami geopotencjału na obszarze Polski. Słowa kluczowe: model EGM08, odstępy quasi-geoidy, wysokości elipsoidalne, wysokości normalne Nie sposób nie zauważyć wpływu, jaki na pomiary geodezyjne ma obecnie globalny system nawigacji satelitarnej GPS. W przeciągu zaledwie kilku lat system ten stał się przodującą technologią w dziedzinie wyznaczania pozycji. Obecnie jesteśmy świadkami przystosowywania technik GPS do wielu obszarów geodezji i nawigacji. Wiele z tych zastosowań wymaga przekształcania wysokości elipsoidalnych z GPS na wysokości względem średniego poziomu morza. Niwelacja geometryczna dostarcza nam wiedzy na temat wysokości, które powszechnie określamy jako wysokości H nad średnim poziomem morza. Powierzchnią odniesienia dla tych wysokości jest powierzchnia pozioma, którą w skali globalnej pokrywa się ze średnim poziomem morza. Tę szczególną powierzchnię poziomą nazywamy geoidą. Wysokości ortometryczne to odległości pionowe od geoidy do powierzchni Ziemi. W przypadku wysokości normalnych powierzchnią odniesienia jest quasi-geoida.
This paper presents geocentric sea level changes at the tide gauge station in Władysławowo, Polan... more This paper presents geocentric sea level changes at the tide gauge station in Władysławowo, Poland. These changes have been calculated from the time series of GNSS and tide gauge observations. For the estimation of the geocentric sea level trend computer software packages Hector, GITSA, GGMatlab, and Statistica have been used. The results show that all the software packages give a similar value of absolute sea level changes in Władysławowo and it is estimated at a rate of around 3 mm/year. The examined computer programs are featured by a different degree of visualization and the simplicity of use. A significant difficulty is to prepare the required data format and the installation of the computer program in the software environment e.g. Matlab. Finally, it can be concluded that the Hector software package, due to the simplicity of input data preparation, that the possibility of on-line calculations and the selection of different error models are very useful for the analysis of time-...
Artificial Satellites, 2021
The aim of this work is to explore, for the first time in Poland, the possibility of determining ... more The aim of this work is to explore, for the first time in Poland, the possibility of determining Earth’s crust movements from permanent observations at selected permanent stations using the GipsyX software for a period of 8 years (2011–2018) in the ITRF2014 reference frame. The data used in this work are from 15 Aktywna Sieć Geodezyjna (ASG)-EUPOS stations from 2011 to 2018, which are also European Permanent Network (EPN) stations. The stations Borowa Góra, Borowiec, Józefosław, Lamkówko, and Wroclaw are also International Global Navigation Satellite Systems (GNSS) Service (IGS) stations. Daily data, rinex files, for these stations have been made available for this work by the Main Office of Surveying and Cartography. The calculations were made using the GipsyX software in the ITRF14 reference frame. The tests performed have shown that daily solutions from 8-year-long time series give secular trends with an accuracy of 0.01 mm/yr. Our results suggest that there are small differences...
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Papers by Adam Lyszkowicz