TLS-detectable plane changes for deformation monitoring

Kregar, Klemen (author), Marjetič, Aleš (author), Savšek, Simona (author)

TLS is nowadays often used for deformation monitoring. As it is not able to scan identical points in different time epochs, mathematical models of objects derived from point clouds have to be used. The most common geometric form to describe built objects is a plane, which can be described by four parameters. In this study, we aimed to find out how small changes in the parameters of the plane can be detected by TLS. We aimed to eliminate all possible factors that influence the scanning. Then, we shifted and tilted a finite physical representation of a plane in a controlled way. After each controlled change, the board was scanned several times and the parameters of the plane were calculated. We used two different types of scanning devices and compared their performance. The changes in the plane parameters were compared with the actual change values and statistically tested. The results show that TLS detects shifts in the millimetre range and tilts of 150” (for a 1 m plane). A robotic total station can achieve twice the precision of TLS despite lower density and slower performance. For deformation monitoring, we strongly recommend repeating each scan several times (i) to check for gross errors and (ii) to obtain a realistic precision estimate.

• Language: English
• Keywords: deformations, detectable plane changes, TLS, robotic total station, wooden board platform, tilting, shifting, X2 statistical testing
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: 18 str.
• Numbering: Vol. 22, iss. 12, art. 4493
• PID: 20.500.12556/RUL-137826
• UDC: 528
• ISSN on article: 1424-8220
• DOI: 10.3390/s22124493
• COBISS.SI-ID: 111679491
• Publication date in RUL: 01.07.2022

Record is a part of a journal

• Title: Sensors
• Shortened title: Sensors
• Publisher: MDPI
• ISSN: 1424-8220
• COBISS.SI-ID: 10176278

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 14.06.2022

Secondary language

• Language: Slovenian
• Keywords: deformacije, zaznavne spremembe ravnin, TLS, robotizirani tahimeter, platforma lesene plošče, nagibanje, zamikanje, statistično testiranje