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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Opakovaná GPS měření na polygonu Tetčice a jejich interpretace / Repeated GPS measurements at Tetčice polygon and its interpretation

Dvořák, Jiří January 2012 (has links)
This thesis deals with monitoring shifts in the vicinity of the village Tetčice. The site is located at the interface of geomorphological units. Monitor the area is done in stages and methods of using GPS and precise leveling. Points tested are expected movements in places the earth's crust, which are stabilized on the pillars in order to avoid possible negative effects. The work builds on results from previous measurements.
2

Study on ongoing subsidence in Uppsala City using Sentinel-1 radar data

Fryksten, Jonas January 2019 (has links)
Many cities in Sweden are partly located on clay and because of that, some urban city centres are undergoing significant subsidence. To measure subsidence in cities, precise leveling has been the traditional technique, but the interest for the Persistent Scatter InSAR (PSI) technique has increased in the last years, in this application. With the PSI technique, a mm-accuracy can be obtained and the analyses can be done over large areas. In this study, a validation between the PSI and the precise leveling techniques was performed for a selection of buildings located in areas that are facing great subsidence. A correlation between the subsidence rate achieved in the PSI analyses and near-surface soil type was also done, to easier identify risk zones. The city of Uppsala was chosen as study area, because it is partly built on deep layers of clay and the consulting company Bjerking AB has established a leveling network with metal pegs on many buildings. One ascending and one descending PSI analysis was performed, with Sentinel-1 data from the period mid-2015 to mid-2019, and the PSI analyses were done in SARPROZ. After the PSI analyses, comparative permanent scatters (PS) points and metal pegs were identified creating validation pairs. 15 different validation pairs were identified in four different objects, which was one or two buildings. The PSI analyses showed that Uppsala is undergoing significant subsidence in some parts, with an annual rate of about 6 mm/year in the line-of-sight (LOS) direction, which corresponds to about 7.5 mm/year in the vertical direction. The areas of greatest deformation were exclusively found on postglacial clay. The standard deviation of the time series were calculated around their linear regression lines, which was a measure of how temporal coherent the points were. The mean of this standard deviation for the PS points in the 15 validation pairs was 1.5 mm. This standard deviation increased to 2.3 mm in the time series where the direction was transformed from LOS to vertical and where the movements were in respect to the benchmarks. Between the PSI and the precise leveling techniques, in the validation, the vertical subsidence rate differed less than 1 mm/year in all validation pairs and the mean of all differences was 0.56 mm/year. Based on these results, Sentinel-1 data can measure urban subsidence in a satisfactory way, when the PSI technique is applied.
3

Určení vertikálních posunů objektu kolejí JAMU v Brně / Vertical Displacement Measurements at JAMU dorm in Brno

Dörrer, Tomáš January 2013 (has links)
The subject of the diploma thesis is a height measurement done within several time periods, in order to detect vertical displacements of an object of dormitories of JAMU on Novobranska street in Brno. The thesis includes selection of the method and its accuracy verification and also processing of the measurements and suitable interpretation of achieved results.
4

Geodetické měření posunů a deformací mostu "Gagarin" / Geodetic Deformation Measurements of "Gagarin" Bridge.

Kováč, Michal January 2013 (has links)
The content of this master´s thesis is a geodetic measuring of movements and deformations of skeleton and underwork of „Gagarin“ railway bridge during the seventh period and processing of the data got. This was done by comparison of the movements according to the fifth and sixth period. The work includes also the calibration of appliance used. The results involve figures of the movements with their graphic interpretation and calibration sheets of the appliance.
5

Měření horizontálních a vertikálních posunů gabionové zdi / Deformation Surveying of Supporting Wall

Zbránek, Jakub January 2014 (has links)
The main subject of this diploma thesis is monitoring of horizontal and vertical displacements of the supporting wall in village Smědčice. The thesis describes the whole production process, from construction of the reference net and the net of observed points to the final review. There are also displayed main theoretical basis. Final outputs of the thesis are charts, graphical sketches, tables and final word summary.

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