Browsing by Subject "gravity anomaly"

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Badania mikrograwimetryczne wybranego poniemieckiego obiektu fortyfikacyjnego
(Data obrony: 2017-01-19) Chojnacka, Anna
Wydział Geologii, Geofizyki i Ochrony Środowiska
Mikrograwimetria jest metodą wyodrębnioną z grawimetrii stosowanej. Znalazła ona zastosowanie m.in. do rozpoznawania pustek i przypowierzchniowych form antropogenicznych niewielkich rozmiarów. Projekt inżynierski oparty jest na badaniu mikrograwimetrycznym wykonanym w celu sprawdzenia tezy o połączeniu dwóch schronów bojowych. Zlokalizowane są one w Gliwicach na terenie, gdzie w czasach II wojny światowej przebiegała granica polsko-niemiecka. Przesłanki o istnieniu tunelu pochodzą od mieszkańców. Na podstawie obliczonej anomalii mikrograwimetrycznej można stwierdzić czy poszukiwana pustka istnieje.
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Program do modelowania grawimetrycznego metodą wielościanów
(Data obrony: 2010-01-07) Wolny, Stanisław
Wydział Geologii, Geofizyki i Ochrony Środowiska
This thesis presents requirements and implementation of a computer program which performs forward modeling of the gravity anomaly. Gravity effect comes from homogeneous polyhedral body. Shape of the body is reconstructed from its parallel planar cross sections’ contours. Program performs mentioned reconstruction composing body’s surface as a mesh of triangular facets. Those facets are then used to perform calculation of gravity effect using algorithm which implements polyhedron method. Modeling result is presented both graphically and in a tabular form.
Access status: Open Access ,
Refined astrogravimetric geoid in Poland - Part 1
(2010) Łyszkowicz, Adam
Deflections of the vertical were traditionally used for modelling geoid on local and regional scale. First astrogeodetic geoid model for Poland was developed in 1961 while the last was calculated in 2005 in the framework of the project on precise geoid modelling. That model was developed using the improved deflections of the vertical, both astronomic and gravimetric. There are several effects, that were not fully considered, and problems that were not completely solved. They concern quality of archival astrogravimetric data, problem of weighting, the effects of plumb line curvature and elimination of outlying observations. In addition, all those geoid models were determined with the use of simplified astronomical levelling approach. The aim of this study was to improve the astrogravimetric geoid model in Poland by improving the procedure of astrogravimetric geoid modelling and by using improved data. In the part I of this paper theoretical background of astronomic levelling and least squares collocation methods are given. Then the accuracy of the components of the deflections of the vertical was estimated and the weights of astrogeodetic and astrogravimetric deflections of the vertical were determined. After that in the part II ( Geomatics and Environmental Engineering , Vol. 4, No. 2, in print) the astrogeodetic and astrogravimetric geoid models were determined from improved deflections of the vertical with the use of astronomical levelling. Other astrogeodetic and astrogravimetric geoid models were determined by least squares collocation with additional use of gravity anomalies. All models were compared with the GPS/levelling geoid of the satellite POLREF network. The results obtained indicate that both astrogeodetic and astrogravimetric geoid models determined from the same input data using least squares collocation approach is by factor 5 to 7 more accurate than the ones obtained using classical astronomical levelling.
Access status: Open Access ,
Refined astrogravimetric geoid in Poland - Part II
(2010) Łyszkowicz, Adam
Deflections of the vertical were traditionally used for modelling geoid on local and regional scale. First astrogeodetic geoid model for Poland was developed in 1961 while the last was calculated in 2005 in the framework of the project on precise geoid modelling. That model was developed using the improved deflections of the vertical, both astronomic and gravimetric. There are several effects, that were not fully considered, and problems that were not completely solved. They concern quality of archival astrogravimetric data, problem of weighting, the effects of plumb line curvature and elimination of outlying observations. In addition, all those geoid models were determined with the use of simplified astronomical levelling approach. The aim of this study was to improve the astrogravimetric geoid model in Poland by improving the procedure of astrogravimetric geoid modelling and by using improved data. In the part I of this paper ('Geomatics and Environmental Engineering', Vol. 4, No. 1) theoretical background of astronomic levelling and least squares collocation methods are given. Then the accuracy of the components of the deflections of the vertical was estimated and the weights of astrogeodetic and astrogravimetric deflections of the vertical were determined. After that in the part II the astrogeodetic and astrogravimetric geoid models were determined from improved deflections of the vertical with the use of astronomical levelling. Other astrogeodetic and astrogravimetric geoid models were determined by least squares collocation with additional use of gravity anomalies. All four computed models were compared with the GPS/levelling geoid of the satellite POLREF network. The results obtained indicate that both astrogeodetic and astrogravimetric geoid models determined from the same input data using least squares collocation approach is by factor 5 to 7 more accurate than the ones obtained using classical astronomical levelling.