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Določanje meje zaznavanja sprememb parametrov ravnine pri skeniranju s TLS : magistrsko delo
Žnidaršič, Tamara (Author), Savšek, Simona (Mentor) More about this mentor... This link opens in a new window, Kregar, Klemen (Co-mentor)

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Abstract
Zaznavanje premikov in deformacijska analiza predstavljata eno izmed najzahtevnejših nalog geodezije, predvsem zato, ker z ugotavljanjem premikov in njihovo sanacijo preprečujemo poškodbe ali celo porušitev objekta ter tako zagotavljamo varnost za širšo okolico. Zato smo se v magistrski nalogi ukvarjali z zaznavanjem premikov nagibne plošče, ki smo jo skenirali s terestričnim laserskim skenerjem. Za izvedbo praktičnega dela naloge smo izdelali platformo za odklon plošče. Z odklonom plošče smo simulirali premik, ki ga z različnimi postopki obdelave oblakov točk želimo zaznati in ovrednotiti. Ploščo smo skenirali v treh izmerah, na treh različnih oddaljenostih, v treh nagibih, v različnih odklonih in z dvema tipoma instrumentov (Riegl VZ-400 in Leica Nova Multistation MS50). Podatke skeniranja smo najprej filtrirali z algoritmom RANSAC, nato smo izračunali vrednosti parametrov ravnine, ter s splošnim modelom izravnave ocenili natančnost parametrov. Za izravnane parametre smo s statističnim testom, z uporabo teoretičnega in empiričnega standardnega odklona, ugotavljali značilnost odklona oziroma premika plošče ter tako določili mejo premika, ki jo s skeniranjem s terestričnim laserskim skenerjem še lahko zaznamo.

Language:Slovenian
Keywords:terestrično lasersko skeniranje, platforma za odklon plošče, zaznavanje sprememb, deformacijska analiza, RANSAC, izravnava ravnine, statistično testiranje, analiza variance ANOVA
Work type:Master's thesis/paper (mb22)
Tipology:2.09 - Master's Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2019
Publisher:[T. Žnidaršič]
UDC:528.7/.8(043.3)
COBISS.SI-ID:8821089 Link is opened in a new window
Views:571
Downloads:259
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Secondary language

Language:English
Title:Determing limits of detection of plane parameter changes in TLS scanning : master thesis
Abstract:
As one of the most demanding tasks of geodesy, change detection and deformation analyses are important for the wider audience as well. This is due to the fact that by determining deformation and the restoration of it, we prevent object damage or even destruction and thus, ensure the safety of its wider surroundings. Therefore, this thesis focuses on detecting the incline board displacement by scanning it with a terrestrial laser scanner. In the practical part of the thesis, a platform for board declination was created. Board declination simulated change which we wished to detect and evaluate by different procedures using point clouds. The board was scanned in three different measures, at three different distances, at three inclines, at various declinations, and with two types of instruments (Riegl VZ-400 and Leica Nova Multistation MS50). The data from the scanner was first filtered through the RANSAC algorithm, then approximate values of plane parameters were calculated and nally, using the general least square adjustment, the accuracy of the parameters was assessed. Using statistical test, with theoretical and empirical standard deviation, we tried to determine if the change of parameters is statistically signicant, thus determing the limit of board declination, where change can be detected by scanning with terrestrial laser scanner.

Keywords:terrestrial laser scanning, platform for the declination of the plate, change detection, deformation analysis, RANSAC, least square adjustment of plane, statistical testing, analysis of variance ANOVA

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