Investigating the Applicability of
Standard Software Packages for Laser
Scanner Based Deformation Analyses
FIG Working Week 2017
01.06.2017
Christoph Holst, Berit Schmitz, Heiner
Kuhlmann
University of Bonn
Institute of Geodesy and
Geoinformation
Presented at th
e FIG W
orking Week 2017,
May 29 - June 2, 2
017 in Helsinki, F
inland
Congruency test
1. Differences between corresponding points
2. Stochastic model
Heiner Kuhlmann, Laser Scanner Based Deformation Analysis Folie 2
Point based deformation analysis
01.06.2017
www.leica-geosystems.com
𝑇 =𝒅𝑇𝑸𝑑𝑑
−1𝒅/ℎ
𝑠02
≥ 𝐹ℎ,𝑓,1−𝛼
1. Corresponding points ?
• One possiblity: Point cloud comparison
2. Stochastic model ?
• Difficult!
• Many influencing factors: misconstruction of laser scanner, incidence
angle, reflectivity/material/color of surface
=> In practice:
Heiner Kuhlmann, Laser Scanner Based Deformation Analysis Folie 3
TLS-based deformation analysis
01.06.2017
www.leica-geosystems.com
𝑇 =𝒅𝑇𝑸𝑑𝑑
−1𝒅/ℎ
𝑠02
≥ 𝐹ℎ,𝑓,1−𝛼
Possibilities implemented in standard software
(e.g. 3DReshaper, CloudCompare, Geomagic Studio/Control)
• Cloud to cloud comparison (C2C)
• Cloud to mesh comparison (C2M)
• Mesh to mesh comparsion (M2M)
• Multiscale model to model cloud comparison (M3C2)
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Point cloud comparison
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Reduction
of random
errors
Is these point cloud comparison applicable
for geodetic deformation analysis?
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Case 1: Out-of-plane shape deformation
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blue: epoch 1
green: epoch 2
• Yes: Large differences where shape is deformed
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Case 1: Out-of-plane shape deformation
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Case 2: In-plane rigid body movement
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• No: Large differences only at high surface curvature
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Case 2: In-plane rigid body movement
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• Wooden panel
• Water dam
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Two examples in paper
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M3C2 (CloudCompare)
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[m]
Shape deformation of 6 mm to water side
Leica P20, 2 epochs: march and june 2016
• At TLS-based deformation analyses, no corresponding
points between epochs
• Detection of „deformations“ / differences by point cloud
comparison is possible
• Usefulness of point cloud comparison depends on direction
of deformation (in-plane or out-of-plane)
• No stochstic model, no significance range
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Conclusion
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Thanks for your attention!
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Example 1: Deformation wooden panel
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Out-of-plane shape deformation
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Deformation of 23 mm
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C2M (Geomagic Control)
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[m]
Deformation of
about 23 mm visible!
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In-plane rigid body movement
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Translation and rotation of about 30…50 mm
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M2M (Geomagic Control)
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[m]
15 mm = Distance to wall
Moved area
Rigid body movement of 30…50 mm
not visible in results
• 3 stations
• 2 epochs
• Registration by targets
Heiner Kuhlmann, Laser Scanner Based Deformation Analysis Folie 19
Example 2: Deformation water dam
01.06.2017
AVN 6/2016
• Holst, Neuner, Wieser, Wunderlich, Kuhlmann: Calibration of
Terrestrial Laser Scanners
• Kauker, Holst, Schwieger, Kuhlmann, Schön: Spatio-Temporal
Correlations of Terrestrial Laser Scanning
• Wujanz, Holst, Neitzel, Kuhlmann, Niemeier, Schwieger: Survey
Configuration for Terrestrial Laser Scanning
AVN 11/2016
• Neuner, Holst, Kuhlmann: Overview on Current Modelling Strategies
of Point Clouds for Deformation Analysis
• Wunderlich, Niemeier, Wujanz, Holst, Neitzel, Kuhlmann: Areal
Deformation Analysis from Point Clouds – the Challenge
• Bureick, Neuner, Harmening, Neumann: Curve- and Surface-
Approximation of 3D-point clouds
Heiner Kuhlmann, Laser Scanner Based Deformation Analysis Folie 20
2 special issues in avn
01.06.2017