Terrestrial laser scanning

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Project presentation of terrestrial laser scanning for the "3D Remote Sensing" module at the University of Southampton.

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  • Removed all the areas where the laser saw through the window and the blue areas are where patching has occured
  • Terrestrial laser scanning

    1. 1. Brown, L., Drew, O., Kramer, I., Maranzu, V. and Rouse, C. Terrestrial Laser Scanning for 3D Building Modelling
    2. 2. Output & Validation Data Processing Registration Noise removal Data Collection Leica C10 Site selection 3D Mapping Available methods TLS The Proposed Work
    3. 3. Available Methods • Increasing demand for 3D building models • Range of techniques available (Arayici, 2007; Mill et al., 2013): • Traditional survey • Tape measure • Surveyor’s wheel • Electronic distance meter • Total station • Close range photogrammetry
    4. 4. Terrestrial Laser Scanning Definition: “a ground-based, active imaging method that rapidly acquires accurate, dense 3D point clouds of object surfaces by laser range-finding” (Lichti, 2015)
    5. 5. Terrestrial Laser Scanning Three types: 1. Triangulation-based 2. Pulse-based 3. Phase-based • Over 1,000,000 pps • Max. range 80m • Comparable accuracy • 10,000-100,000 pps • Max. range 300m • 4-10mm accuracy
    6. 6. Terrestrial Laser Scanning • Rapid acquisition • Non-invasive • Day or night operation Source: rudi.net/files/paper/illustrations/composite.jpg
    7. 7. C10 Pulse-based Green wavelength: 532nm Point density: 50,000 Positional accuracy: 4mm Range: 300m @ 90% Source: http://hds.leica-geosystems.com
    8. 8. Data Collection Resolution: 2cm at 20m Max distance: 4m Time: 7 minutes per scan Points collected: ~21 million Field-of-View: 270° (vertical) 360°(horizontal)
    9. 9. ProcessingRegistrationDatabase Processing in Cyclone 9.0 Raw Data • Noise Removal • 3D Model • Cloud-to-Cloud • Add Constraints
    10. 10. Constraints (Control points) Scan 1 Scan 2
    11. 11. Registered Point-clouds
    12. 12. People Objects Shadow Outside capture Errors Noise Removal Registered Cleaned
    13. 13. 3D Modelling
    14. 14. Output
    15. 15. Output
    16. 16. Object TLS (cm) Observed (cm) Error (cm) Height Poster frame 120.0 119.4 -0.6 Wall A 273.0 274.7 1.7 Double door 203.5 203.1 -0.4 Step 16.5 16.6 0.1 Wall B 279.0 278.3 -0.7 Width Single door 83.5 83.4 -0.1 Double door 161.5 160.6 -0.9 Flower pot 39.5 38.4 -1.1 Step 118.0 117.4 -0.6 Chair 43.5 42.5 -1.0 RMSE 1.0 Validation
    17. 17. Improved Data Collection • Full coverage • Additional corridor • Additional stairs • Three stations • Quicker • Less accurate • Difficult registration
    18. 18. • Leica P40 Scanner • Combination of phase-based and pulse-based • Spatial resolution: 1.2mm • 1,000,000 pps • Positional accuracy: 3mm • Integrated approach • Multiple scans of varying resolutions • High-definition targets • Undertake in morning/at night • Additional software (SketchUp, AutoCAD) Future Work http://www.comptonmoving.com/http://hds.leica-geosystems.com/Bastonero et al., 2014http://www.coroflot.com/
    19. 19. Summary
    20. 20. References • Arayici, Y., 2007. An approach for real world data modelling with the 3D terrestrial laser scanner for built environment, Automation in Construction, 16, 816-829. • Bastonero, P., et al., 2014. Fusion of 3D models derived from TLS and image-based techniques for CH enhanced documentation, ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume 2, ISPRS Technical Commission V Symposium. • El-Hakim et al., 1997. System for Indoor 3-D Mapping and Virtual Environments, SPIE, 3174, 21-35. • Feng, Q., 2012. Advantages By Phase-based 3D Laser Scanning Techniques to Underground Construction, International Society for Rock Mechanics. • Lee, S.Y., et al., 2013. 3D Data Acquisition for Indoor Assets Using Terrestrial Laser Scanning, ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume 2, ISPRS 8th 3DGeoInfo Conference & WG II/2 Workshop, 27-29. • Lichti, D., 2015. Special Issue "Terrestrial Laser Scanning“, Remote Sensing. • MENSI, 2012. Technical specifications. Available from: http://mensi.free.fr/english/specsoi.htm • Mill, T., et al., 2013. Combined 3D building surveying techniques – terrestrial laser scanning (TLS) and total station surveying for BIM data management purposes, Journal of Civil Engineering and Management, 19, 1, S23-S32. • Ordonez, C., et al., 2010. Measuring building facades with a low-cost closerange photogrammetry system, Automation in Construction, 19, 6, 742749. • Williams, K.E., et al., 2012. Accuracy Assessment Of Geo-referencing Methodologies For Terrestrial Laser Scan Site Surveys, ASPRS Annual Conference, Sacramento, California.

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