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Utvärdering av möjligheten att använda fotobaserad skanning för deformationsmätningar
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
2012 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Geodetiska deformationsmätningar utförs med antingen punktbaserade metoder som t.ex. mätning med totalstation, avvägningsinstrument och GNSS-mottagare eller ytbaserat med exempelvis terrester laserskanning (TLS). I den här rapporten föreslås ett nytt, billigare, alternativ för ytbaserad mätning av deformationer som sedan utvärderas och jämförs med TLS. Den nya metoden kallas fotobaserad skanning (FBS) och baseras på digital bildmatchning genom vilken tredimensionella punktmoln kan skapas. Deformationer simulerades på ett testobjekt (en spånskiva) som sedan mättes in med både FBS och TLS. För FBS användes en digitalkamera Nikon D7000 och för TLS en laserskanner Leica ScanStation C10. Efterbehandling av data skedde i programvarorna PhotoModeler Scanner och Leica Cyclone 7.3.  Plan anpassades till punktmolnen och deformationerna analyserades. Resultaten för FBS i den här studien stämmer bra överrens med en del tidigare studier. I det andra experimentet (FBS2) är avvikelserna från de kända deformationerna är mindre än 5 mm och hypotesprövning från visar att alla utom en av de simulerade deformationerna kan upptäckas. TLS presterade dock ännu bättre, alla avvikelser är mindre än 1 mm och enligt hypotesprövningen kan alla deformationer upptäckas. För att få FBS att ge bäst resultat finns dock vissa faktorer som behöver tas hänsyn till, den viktigaste bedöms i denna studie vara kamerans riktning mot objektet. Avslutningsvis kan det konstateras att FBS har stor potential inom deformationsmätning men att vidare studier krävs för att utreda en del frågor.

Abstract [en]

Deformation monitoring with geodetic methods is done by either point-based methods such as using total stations, leveling and GNSS or surface-based methods using e.g. terrestrial laser scanning (TLS). In this study a new, cheaper alternative for area-based deformation monitoring is presented which also is evaluated and compared to TLS. The new method is called photo-based scanning (PBS) and is based on digital image matching from which 3D point clouds can be created. Deformations were simulated on a test object (a particle board) which was measured with both PBS and TLS. A Nikon D7000 digital camera was used for PBS and a Leica ScanStation C10 for TLS measurements. Post processing was made in PhotoModeler Scanner and Leica Cyclone 7.3. Planes were fitted to the point clouds and the deformations were analyzed. The results for PBS in this study are similar to some of the earlier studies that have been made. The deviations from the known deformations are all below 5 mm for the second experiment (PBS2) and the results from the statistical hypothesis test of PBS2 shows that all but one of the simulated deformations can be discovered. However, the results from TLS are even better, all deviations are below 1 mm and all deformations can be discovered according to the statistical hypothesis test. To achieve the best results with PBS there are a few factors to consider. In this study the angle between the camera station and the object is regarded as the most important one. In conclusion, PBS have a large potential as a technique for deformation monitoring but additional studies should be made to resolve some of the issues. 

Place, publisher, year, edition, pages
2012. , v+31 p.
National Category
Other Civil Engineering
Identifiers
URN: urn:nbn:se:hig:diva-12596OAI: oai:DiVA.org:hig-12596DiVA: diva2:544735
Subject / course
Lantmäteriteknik
Educational program
Surveying
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-08-16 Created: 2012-08-14 Last updated: 2012-08-16Bibliographically approved

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